They do make money. You just need to find a niche though. Don't do something that's been done to death. Like, straight college guys solo, for example, is done to death. There's 2 or 3 major sites that fans of that stuff know where to go. and competing with them can be hard and take longer then 6 months to establish. You probably want to go for something wild and out there to get some attention fast. Solo has it's place, just try and be different.