I think it helps if you do something "unique" and aren't just jerking off. For me, I discovered a few years ago that a ton of people really get off on watching a guy shoot cum on a picture, whether it be of a famous person or someone they know. I don't have a giant cock, but I've always been "blessed" with the ability to produce giant loads, so I became pretty popular for my cum pics and eventually videos. I even managed to make some decent cash for custom vids, where I would do or say certain things by request. I have since gotten away from it, but I'm sure there is still a market for this kind of thing.
Cheers,
Riddle