Not that I do it, but I can kind of see why people might "charge" for entrance.
I created a game room and this is what I have to do to create it:
1) Play Hyperspace mountain until I win room
2) Use credits to buy any needed furniture
3) Think up almost 80 different vmk trivia questions, translate them into VMK speak, and type them out
4) Buy prizes
5) Spend my time running game room for hours
What do I get:
1) Some appreciative players,
but
2) Hurt hands from all the typing
3) People who shout out the answers, ruining the game
4) People who threaten to report you because you won't let them play next or won't repeat the question because they were busy typing nonsense while sitting in the "hot seat"
So since you give much, and get little, I can see that you might want to charge a little bit to help pay for prizes and to make sure only people that really want to be there are there. But, I don't, so all the new players can have a chance to play and win.
Okay, maybe you win Best Game Room after all!!
