But for porns, I don't think anybody will ever pay for it as anyone can get it for free now and all of them are in HD qualities.
It's a different market. You get personalized services and not just generic pr0n.
Also, I like xotika.tv. It is fun to interact with the girls and spend a few bits. They also have a very decent (and fair) sig campaign going on last I heard.
I have never bothered with tipping to girls in the regular cam sites like myfreecams and stuff because it's too much work, but I may do this with BTC since it's way more convenient, just for the sake of doing it. I never understood why people tip real money tho as in big quantities. Sometimes it's hilarious to see some rich guy tipping a lot of cash and seeing the girls go nuts and everyone in the comments. I guess they get a kick from that.