Bradum: Bradum: Casino$

Might be possible. Having multiple currencies is how many free-to-play games handle it actually—especially in the mobile market. You will see “gems” which can be bought for real cash and then “coins” which can only be earned, for example. Usually the two are deliberately not exchangeable.

I don’t like this mechanic though. It seems overly complicated and it’s a departure from the realism of GTA.

One way of tackling it is to create a narrative around gambling being illegal and have all funds come from your “Swiss Bank Account” which has no i/o with your standard account. Just thinking about random potentially interesting solves here.

I still say most likely there will be no player-controlled gambling (or it will be 100% free/for fun). The mechanics will mirror the nightclub in that it’s essentially a front business with a backend that has more playability.

There are some interesting backend interfaces you could build for it even with NPC gambling being the limit. For example, you could balance popularity with short term take by way of rigging the slot machine payouts. Or you could higher better dealers, or cheat dealers, etc.