Not everyone, but quite a substantial amount are using their money to pick up some CIs and EIs. Other than the event wings earned by buds, I don't think commons have as much impact on the economy.

I agree with wish. 500-1000 seems like a reasonable cap to me, and capping the number of times a person can play would be horrible for games like snake. Limits on gold are much more reasonable.

@Naeru - 50g is the max anyone can get from a game. For those that are good at whatever they choose, they can get 500g from just 10 plays.