Many rooms have clones, for what? Pokerstars has Full Tilt, N8 - GGpoker, ACR-BCP and Ya.

PokerStars and Full Tilt were separate companies and their software was completely different.

But then PokerStars bought Full Tilt and then made Full Tilt just a skin of PokerStars.

"Clones of popular rooms", they make part of the same network (Winning Poker Network) I don’t know the main reason, but each one has things that the other doesn't have like, Mac support, different deposit bonus and different mobile compatibility.

I think that the more rooms, the better for the players. Rooms should compete among themselves for players, offer good promotions, bonuses, ...