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				Since the only way to get to them is through your circle how many travel through the first 100 to ever see the last 100? Thats a lot of stroking.
			
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  Not quite the right way of thinking. Alot of these sites try to target niches. They can come in from anywhere in your list of sites. If you are linking hundreds of sites with different names they are trying to get the surfer that is looking for a site with that particular content that they choose because of the name. Then they send them to a program that has that type of content. It is a type of filtering. 
I don't make my sites like this because I wouldn't buy something off a site like this but many people do.