I wrote out a nice 1000+ words and it wouldn't allow me to post it, so I am going to make this 2nd one short lol.
To make a long story short, yes we use it for our business and have found that it works great. We use this on 2200 + clients on a monthly basis give or take a few, I am not sure where we are at this month.
Again this all depends on the niche, site type, competitiveness of a keywords, etc... General SEO is going to rank up low competitive keywords, mid comp keywords your going to need little of everything I talked about , and competitive keywords your going to need all of them and then some.
Take SEO services keyword for example. Analyze why they are ranked up where they are. I can tell you quick... 73 domains they built, AKA a network. They then diversified it with some other low quality types so they don't get penalized for anchor text diversity issues. They have a great platform diversity, and not to mention their class C ip span across multiple. All 73 domains have a min authority of 40 from what I could send from a 15 min check or so.
So if I wanted to beat that site, I know 1... I need better tactics, I need to beat their social media. I know that I need to make 80 domains that have a min of 45 authority from every page and better page rank as well... I don't believe in page rank much anymore, but it's burnt into my mind from using it for so many years. So I buy pr + domain authority to make sure I can't go wrong... I analyze for traffic, possible keywords, niche type etc.. This all plays into factors when you build a network.
This is the method that works to rank SEO services to rank 1 in the world, because I helped do it some time ago. Although the sites that they are using now are very low quality and it is mostly likely a rinse and repeat site and will possibly last 3 months top if they keep building more domains.
You can use a $20 domain name with some age, authority and you may as well get some page rank just to be safe. Try to buy a domain with 50 + authority and pr3 +. After that start some general safe link types and diversify it very good. Build links slowly on it for about 2 months, then start building your network and bam... Page 1 rankings as easy as that.
Now for a term like payday loan in the US, it would take hacking like they are doing right now and that is very unethical and not to mention illegal. So would most likely go as far as the network and thats about it..
Have a great night everyone.
Matthew Boley