Because I keep what I won. I gamble exactly 200 dollars. I keep whatever I win. And I'm good at it.
The shop is worded very specifically. You keep what you win and you are reimbursed up to $200 worth of gambling. Every bet I make us a gamble. Everything I won goes to me.
I've been doing it a while now. There's literally no reason to do this shop otherwise. It's a three sometimes four hour ago and I have to drive between 2 and three hours to get to it.