bot bet7k
They tend to change their chips every few years for security reasons but there's a grace period when the withdrawn chips are honored. If MB were to change its chips between your trips you won't have a problem less than a year later.
How to build chip inventory/bypass chip cooldown
Set spawn location as last location.
Max bet on blackjack in penthouse (or casino)
IF YOU WIN: change clothes in bedroom (or change mask through inventory in casino) to save winnings and repeat step 2.