This may be obvious, and something everyone knows already, but I'll type it anyway
I get monthly paychecks from a few cam sponsors. I'm not getting rich, but I'm consistent. When I promote black guys on cams, I surround the promo material with iframes and live video feeds of black guys on cams, that link to the black guy's video chat room. Genius huh?
Same with Asian girls, and Latina Trannies, and every other specific niche I can promote with a video or a picture gallery and surround with iframes and video feeds that lead to that niche's live feed.
I also split it up between promoting "watch this chick for free" and "for only a few bucks this chick will get naked for you." So far, telling the surfer he or she should expect to pay for the goods before he or she gets to the site is more profitable than advertising the free angle.
Again, this is probably incredibly obvious.