I'd probably split, or at least, go in with the intention of splitting, can be a bit too trusting sometimes.
Thing is, I don't get why people don't just always steal. At best, you get all of the money, at worst, you stop the other person from getting the money, you don't come off any worse than how you started, there's nothing to lose. Admittedly, if I were to steal and the other person were to split, I'd offer to split with them after the show.
Also, on Golden Balls, it's ALWAYS old Grannies who are guaranteed to steal. You think you can trust them because they're old and adorable, but nooooooooooo, they'll rob you blind!