The problem is getting 18+ girls to do this. By the time they have become 18 they have heard many stories of girls being found out, blackmailed, bullied, taunted and exposed.
http://www.nytimes.com/roomfordebate...osses-the-line
However a wild crazy 19 year old might be a lot cheaper than a pro shooter who has expenses and models to pay.
Ultimately this content is easy to produce,
if the price paid covers the work required.
As an ex professional porn producer I found shooting my glam teen rubbish for the dying magazine market out paid shooting for the brand new, cool kids on the block, Internet Gurus by a factor of 10. And so did most shooters who could shoot for offline.
Nina ultimately it comes down to price and ROI. If the girls on FB can produce great pics and videos for less money than a professional can, then fine. I could earn more not competing with them. Also if you can buy from them so can every other site owner. So sharing the advice isn't a good idea.
Creating something like Met Art do is a lot tougher but far more rewarding. Because so few can do it.