no -- not really.

for that, i would use second life as your measuring stick.

people will pay professional developers for toys to play with (eq next, for example), but enabling hobby developers to make money off their efforts using your platform? that's hard. and expensive. you wouldn't believe the support nightmare much less things like anti-money-laundering laws you have to deal with from country to country. it'll make you cry.

have you ever tried to push a platform update out underneath an already money-making-but-that's-my-livelihood audience? yeah, i wish whomever luck with that.