Why you keep talking about EOSBet tokens? You don't play with EOSBet tokens, you play with EOS and BTC. However, most volume comes from EOS. They can't create EOS like you claim they can. Also every players account is in full control of it themselves as it's an EOS account of which the player only has the private key.

EOSBet token (BET) is not listed yet, so for the market value of BET tokens is not established yet. However the wagers in their casino made in EOS (again not in control of EOSBet but of the EOS holder) do have market value as you can see on Coinmarketcap as EOS is ranked about 5 or 6th below Bitcoin. So at point of saying something X mount is wagered in USD it means the crypto (EOS) value wagered had a equivalent value of USD said at that point.