Your second statement reads...."If Michigan Wins, I win in a landslide. If Louisville Wins, I don't cash." In reality you lost. No money.
BUT They fucked up offering you a split which makes no sense why they would in the first place.
My question is why are they offering a split to someone who according to vegas odds has more of a chance of losing. Why not keep it legit and whoever wins gets the prize money.
The question is which of the 2 factors takes more precedence?
1) You legitimately didnt win so you should give the money back
2) They offered you a split so you took it. Thats an agreement between men. And they fucked up.
I vote 2
He shouldnt give all the money back b/c he agreed to a split when he could have won.
The pool manager fuced up bigtime. Defying can let him pay for his mistake , or he could give a partial refund. But it's all the pool hosts fault and he's got to take some blame.