No. When pressing the double, you 'new balance' is already set.
It was when the EZbonus system was introduced that we saw what was
really happening. MG fixed this by changing the way EZbonus was shown, but behind the hood, it is still working the same way. Maybe vinylweatherman can give some more details of the bug and the patch that 'fix' it.
By closing the casino before picking a card and then open the casino again, my guess is that you will see your new balance even though you have not picked a card.
It is interesting that when doubling on slots (where you also can pick a suit for *4) is actually not 'cheating', it is first determined when you actually pick one of the symbols.
Zoozie
In MG, if you select "double", but leave the game module before picking, you always used to lose. Then came EZBonus, which revealed how the game really worked.
Slots are different, if you leave the slot after the spin, but have the gamble option switched on, you can still gamble the slot win at a later date by reentering the game.
Sadly, the obvious exploit (given MG's past record) is not present, and one cannot mess with the casino's "brain" a la Hype*
Tested for exploit "negative casino balance leading to possibility of infinite play in real account, potential to Martingale with imaginary money but win real money if successful, and get account locked if not.
I tested for this after reading the MiniVegas rep mention "illegitimate play" with regard to a player who had taken NO bonus, yet had somehow still "abused" the generosity of the casino by playing SLOTS, and had winnings seized.
I STILL don't know what happened here in the no bonus case, but maybe it was just BS from the rep to cover someone's ass for catching innocents up in the bannings & voidings.
The root of this kind of exploit is bad programming, evident in UK Fruit Machines, and in this case would be where a test for a bet greater than available funds did not consider the possibilty of an initial negative balance generated by another event.
If you enter the slot, and the current balance is less than the original win, any attempt to complete the gamble offered fails due to NSF in the casino account, just as would happen if you tried to place a single wager that exceeded the casino balance.
The "patch" simply prevents the credit display from responding to moving the mouse over it while a game is loaded.
Thinking about this though, there is another test I might try in fun mode now that a view has been expressed that the slot gamble is determined when revealing the chosen suit or colour, and not when initially choosing to gamble.