A successful poker room is like a pyramid. That is, there are more small games than large games and the regular small stakes players tend to feed into the larger games.
However, in small limit hold 'em games, the rake is now so large, that it's very difficult to develop regular players. (Thus, you don't have the players to start games and keep games going.) This result can lead to an upside down pyramid which in turn leads to less games in the future. And the answer to this is to reduce the rake