A large portion of revenues for social games/worlds (Zynga, Playdom, Second Life, IMVU, etc) are gotten from users so passionate about the game they pay directl

A large portion of revenues for social games/worlds (Zynga, Playdom, Second Life, IMVU, etc) are gotten from users so passionate about the game they pay directly for credits - that is as clean as it gets and a solid revenue stream even if you cut out the bottom-feeder lead gen offers...