Wheres the credits???

Why is it this game does not allow you to keep the credits earned? I "won" just under 15,000 credits and just like that when the game closed, poof! They were gone. Doesnt really give one the incentive to keep playing or recommend this game because if this is going to keep happening, whats the point??

Whymesswithagoodthing about The Heist HD Slot Machine, v1.0.2