And if we can agree that it is more fun to play with players who have similar amount of chips, we come back to my favourite subject: flooding the market :)
If money just keeps coming into the system and no money gets out, the difference between rich and poor will get bigger. However the amount of players is limited, so there will be less players you could have a nice game with. Poker here has been online for only few days(?) and the highest stacks already are in the 100k range. Imagine how many chips the best players will have for example after a year of playing?