Some people get paid as people buy the porn. The more it sells, the more they make. If it doesn't sell, because it gets ripped off and people get it for free, then the performer doesn't make a whole lot. It sucks!
And LOL at the interest. So much for staying on topic! But seriously, my site gets ripped, and I have to go to these lengths to take down the stolen content. I do a bit of amateur adult work here and there, nothing too crazy. But all these stolen porn sites (like Tumblr) effects my sales I mean, I'm saying that I'm against all free sites that are stolen content, or where the performer doesn't make any money. It just isn't fair to him/her. I think that a lot of people don't really understand how amateur adult models make money. I mean, I'm not saying people have to spend tons of money on porn. But a few bucks here and there to support a porn star or an amateur adult model who you like? Why not? To support her (or him).
Trying to stay on topic .... I don't really like Tumblr for porn.