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Sure it depends on factors like indexation, content and link placement. We consider that too. And links we are building are indexed within 2 days, some of them are indexed even faster. Links which are never indexed can't hold even small value, I'm not even considering them when talking about backlinks. Not indexed backlink = no backlink.
Because sometimes people don't link to the content and sometimes it's easier, faster and profitable to buy backlinks.
It could be so that edu links have no more value than .com's, but only Google knows that. We can only assume whether it holds more value or not. And I think that it does. Because educational institution linking to your site will be great signal to Google. Matt Cutts said many times, that gaining link from BBC or CNN will be better than gaining it for example from your friend Thom's local grocery store's site. Because CNN has bigger authority than your friend's local store.
So, if CNN and BBC sites hold bigger value than other sites, why .edu sites won't hold bigger value than other sites? Only educational institutions can buy .edu domain, so that means they hold big value. For example, if Harvard University will link to your site, don't you think it will hold higher value than one article directory from AMR or one blog from private blog network? I think that it will. It's only assumption though, but considering test results and positive ranking improvements we saw and continue seeing in our serp reports.
Sure, article is spun, because writing 40 unique articles for page would be expensive. For example, if 600 word unique and high quality article costs $5, that will be $40x5= $200. Our prices are in range of $20-$60, so that everyone can afford it. In case we will post unique article on each page, our service will stop being cheap and only small percent of users could afford it. From the launch time, our purpose was and is to give cheap and good service which will help anyone to increase their ranking.
The tactic we use for link building of our clients sites is same for our own sites. And I can tell you, that for 6 years, we managed to get many sites ranked on first page for a long time.
webfeatseo
As I posted above, our clients' sites had good SERP improvements. I'm not going to tell you that our links only will move your site to #1, because no, they won't, you need a lot more than just 40 edu backlinks to rank on #1, but surely our links won't hurt your rankings, they will move your site to higher place and give authority to your domain.
We are tracking SERP movements of our clients and we always saw only positive results. However, you can always try, price isn't too high, we have small prices so that everyone could afford it. What else can I say.
Also, I want to make a note that not all links come from blog posts, some of them are from profile pages. But more than half of profile pages still have content.
About guest blogging - such links are pretty much the same as other links. But they come from .edu domains and you can post about anything you want.
Marisa
That's not the reason to stop link building. Google can do anything they want, anytime they want. They can remove your site from it's index without any reason and nobody will have right to complain, because they own their site and have full rights to their data, plus it's free and you don't pay for being in the index.
Saying that Google can catch you and remove from index for building edu links isn't reason to not build them. You can say that about almost anything. For example: "Google may not like the blue color in your menu bar and remove you from index", "Google may not like one word in your article and remove your from index". So I think you got the point.
Google says don't build or buy links or you will be removed from index since the launch, but if people stop link building, they will loose huge traffic and opportunity to make good amount of money. If you always do what others want and tell you to do, you'll never succeed.
Well, sure there will be other people who post their own articles on the site. We aren't affiliated with those educational sites, if that would be the case, prices would be a lot higher. Sites we post links to are open for registration and anyone can create their own pages there. But that doesn't mean backlink from that site will hurt your rankings, because that's not blog comments or something like that. Nobody can post their link on the page where your link is. Additionally, you can check sample rankings of our clients' sites and you can see SERP improvements.
$25 package is our smallest one and it's kind of "test" package. 40 backlinks package receives 90% of sales. We still don't charge high amount of money because we aren't a large company. Some huge SEO companies use our service to outsource their projects. Additionally, we don't place links on comment pages.