I'm note sure I understood. So you deposit in BTC, and when you enter a game, let's say roulette, or a poker table etc, you convert your BTC to the in game currency. You keep that rate stable and when you exit that game, you convert the in game currency back to BTC at the same rate?
Yes. It's made only to have more or less stable minimal bet and bet increment values. Like a bitcoin payments in dollar casino, but without currency conversion tricks.