Change gameplay so there's not a fee for every round of every game in the rooms. It takes enjoyment out of the game having to spend to play.
Currently, you make players pay coins to enter the game, then charge coins again for each new round/hand in the specialty rooms. It makes you not want to play those rooms, especially considering how often you may not make a phase. Then, you'll be forced to pay AGAIN to replay that phase. If you want people to enjoy the game, charge the one time fee per GAME, and stop charging PER ROUND/HAND.