As to:

Here is to the day that we don't have to make a domain registrar rich!

As an old Marine, we have a saying in that proud group that really applies:

COPY THAT! (A Big I agree) especially with regard to a certain daddy that sucks rocks in Arizona, USA and has girls as his spokes persons...

Hans,

In order to correctly answer this there is more data needed:

Is www.maindomain.com the Main Domain you are potentially pointing the others to?

With the other cctld's, (.eu, .nl, etc) are they sites that are up and running? What about the other .com?

Given you have 'OtherDomain.com's', are they similar sites with a different domain name or are they altogether different sites? Are there domains with languages that are not served by the Main Domain you are redirecting to? Have you looked at traffic to all in GA? What about local?

Is there a business purpose to any of the Non Main sites that would negate changing any of them? Make sure you have talked all the possibilities through with the client or you are going to cause yourself a problem. Please.

What type of "hosting account" is being used? Someone hosting a domain on a network solutions, bluehost, etc for $5 - $10 per month? Dedicated server? Semi dedicated server? etc.

I am not sure who the 'webmaster' is, but they need to understand the reasons you are contemplating this. Frankly, they seem to not want to do the 301's (given the size(# of urls) of the varying domains, varying url structures, are they all exclusively on LAMP stacks or exclusively on IIS, etc. it can be a daunting task.)

If they are simply domains that have no pages or pages with no real link value, a domain to domain redirect takes care of the rare bird who may have one in a bookmark, etc. and, if there is no real chance you would need to worry re bookmarks, you can simply turn them off.

So, you are at a place where you need to answer a lot of questions before you make a decision. A note here since you said, "...a new client.." is that if these are in the least extensive or are critical domains that you really need to be able to preserve the link value or the traffic from you should consider a fee for each domain like that. We charge US $250 for a simple domain to be redirected and a small domain (site) that is critical and has even 10 pages we charge a minimum of US $750. It can go up significantly from there. Why? Because we are a knowledge business and we have learned the knowledge at great cost to us. Also, there is risk involved in this and if something goes wrong, the client will be expecting you to handle it out of your pocket.

If you can answer the questions, I am sure some of us can assist you with the decision tree you face.

Best,

Robert

We are considering using CloudFlare as a CDN for a large group of sites. The fees are $5 to $200 depending on many factors. We tried the free trial on one site and were impressed with the results. I am wondering if any of you have any longer term experience with this and performance metrics, etc.

Hans, 
I am following up as I hear the pain in your writing.

I think we try to avoid bad absolutes here with a passion, but that most here is fairly straightforward. Per what Highland has, and what your needs are, the CName changes are not what I would do. Absolutely not. Ever. (Hope that is clear without telling you what you should do).

As to the problem with the other domains, it is difficult to give a do this or do that due to the fact we are seeing only example.com etc. and there is in no way anything close to the whole picture. It is kind of like going to the doctor and saying I have some pain. If you cannot give specifics, it is too hard to treat. She does not want to give you the wrong drug for the pain you have. We don't either.

To try and cover all of the permutations you could be facing is to have to write a text book in redirect how to, etc. So we are left with more generalities which is what we have given you along with some specifics.

You said this, "The only reason the 20 domain names exist, is to avoid competitors to registrate them." To me, that says, goodbye domains. You also said there are "some links to them," which generally means they were for more than registration prevention. If you do a domain to domain redirect (301 of homepage essentially) you will LIKELY get most of the juice, but your "webmaster" does not want to do that. So, what are your options now:

Shut them down or not. Those are the only options. The CName thing does nothing for you.

So, there you have the most direction I think anyone can give. I sincerely hope it helps,

Robert

Thanks so much for the help here. That is the other piece that we liked about what we saw in the initial tests - security. Here is the data (sorry a bit redacted due to confidentiality needs) from our head of development. It is a reasonably large site with quite a bit of traffic over a short time interval ( a few days)

• 126k total pageviews
• 105k regular visitors
• 20k crawlers/bots
• 1.5k threats (which Cloudflare forces to jump through hoops to access the site, and if failed they are denied)
• 523k total requests for files and pages - 207k were handled by Cloudflare rather than having to be handled by our server
• 8.3 GB of bandwidth total - 2.0 GB of which were handled by CloudFlare, reducing our usage and allowing other sites to deliver faster.

I appreciate the info re cookies, I will have to look into that as there may be client concerns. Great help!

Forget the CNAME, A record as it is all poor advice. (Yes, I said it - poor advice). When you say only one hosting account, etc. (Hosting is virtual hosting. Only for the mainsite. If I was given acccess to the 20 others, I would put a .htaccess with a 301 redirect there. But that's not an option.) there are things that do not add up here. These others to be up MUST be hosted somewhere. Where? They are not parked domains if links are going to them and they link to main site. (They may be a dupe, but they exist.) So let's go another way. First, if you are familiar with ahrefs.com, this is where I am getting the data from. I like a lot of software, but ahrefs is a real go to for me on links at times (not the only one).

For these sites, compared to what you have coming into the main site, I see no tremendous value. Yes, the one has some links, but comparatively to the main site, I do not believe you are going to see much change if you do not have it - if any. But, you could see some change based on your having duplicate content all over Europe. You will end that by shutting these down. I think that is more important than the links issue.

If you want to give the client comfort I would suggest something we are doing with a client we are taking from about 50 domains (some with significant links others are so what domains) to ONE: We classified ours as Critical, Basic, and Goodbye. For the Critical it is full 301 etc. for the Basic it is a homepage to homepage (client had input on this) and for the others we are ending them with a domain to domain for 90 days then goodbye. NOTE: They actually had little duplicate content. We do a few a week and so far no loss. For yours do one of these every week or two and start with the nothing ones. Then if the last one www.vochtweringsbedrijf.nl and you turn it off and a week or two later you have an issue, you will know that is the issue and be able to choose to revive or not. (I do not think you will).

Make sure you look at analytics at traffic (my guess is it is little or none) for the sites and if one is getting a lot, then you have a reason to keep it. As it stands now, you are screwing up local, SEO overall, duped content, etc. This should be an improvement - based on the info I have at hand.

All the best, and welcome aboard Moz.

Robert

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jStrong,

Thanks for the info. I think responded to both you and Prestashop at once, sorry. I like the security features a lot given some client sites are fairly sensitive. 
Best

Peter

I agree with Jon,

Also, your page is loading quite slowly when I use Google Pagespeed insights. You might want to run it on the site and just look at what it is suggesting.

Hope this helps you out,

Robert

I forgot to post before I hit good answer and it wiped out my comments. Thanks for the detailed response. I will show our info to our head of dev. 
Best

Our intent is to subscribe to pro, go with the lower option $5 per month on less critical sites and the much higher options on critical high performance sites. I really appreciate the input and time, I am glad I had one last good answer to give. 
All the best,

Robert