Well, I did go through a lot of trouble to sneak up and take the wallet without the guy noticing, so I'd say 60/40, with me getting the bigger cut.

[Actually he's (mostly) just saying that to see what Firo's reaction would be rather than being completely serious. Otherwise, if they did split the money 50/50, he'd probably be okay with it...provided that he gets to keep the wallet itself too.]