I don't want to pay up in a competition
Why wouldn't you honor your side of the deal?
I'm determined to break the rules with this
I don't think that's fair on your part.  Nobody likes a sore loser!  You'll find it's hard to place fun bets with people in the future if you act like that.
I'll keep doing it because I can.
You're going to get into trouble if you keep doing this. You shouldn't act like a sore loser and pay up what you owe.