To play in a Poker Tournament, you register and pay the Tournament buy-in. A small fraction of the total buy-in, called the 'entry fee', is retained by Rainbow Riches Casino for administration of the Tournament.
The large majority of the buy-in goes toward the prize pool, which funds the prizes. The entry fee is normally 10% or less of the buy-in.
In some cases, a Tournament may have zero entry fee, or zero buy-in, with free prizes provided by Rainbow Riches Casino.
For full details on Tournament buy-ins and entry fees, please visit the Game Rules section in the Poker Lobby.