single girl site craze?

Just filling up the gaps left by years of generic hardcore DVD rip sites coming out week after week

Reasonable gambles. The cost of investment if brutally small in comparison to most pay site models. Potential for a large profit margin exists even if the site only receives marginal promotion. Comes backed up with a exit strategy that will salvage most if not all of the up front content costs, that being if site fails they can always just close it down or leave it up and find a broker to sell out the content sets.

Bandwidth is cheap.
Initial content falls into the ranges of free to several grand. (free is if it is a rev share with the model, though this looses one exit strategy.)
If you are already established with a processor there is no extra costs to add a pay site.
Design can be done super cheap since many put little focus on it and outsourcing has driven the price into the dirt.
TGP and blog owners are addicted to new material so almost anything released gets some promotion.

I'm suprised this one didnt get more discussion

doesn't need much discussion. ASM said in a few paragraphs what i was going to say in two words.

it's cheap.

I agree with you on that all these new thumb tgps and blogs always want fresh faces. I hope webmasters are acutally checking out some of these single girl site members areas. Some are terrible no type of updates, that really hurts when you are on revshare