To multiply your poker winnings, perform the following steps:
1. Save your game near any poker table. 2. Play poker. 3. Go "all-in" immediately, and press RB to "Skip to your turn." 4. If you won, press B (to exit) then A (to confirm) and as many times as you can (B, A, B, A, B, A). If not, load your game and repeat steps 2-4.
You should hear the sound effect for leaving the poker game multiple times, and, if you wait a short period, you will notice that your winnings are given to you the same multiple of times you managed to press B, A before actually standing up. If you manage to out 2 people (all-in will remove players from the table) that's 75$ at the very start of the game given to your wallet up to 4 times.