Pathetic right? But these things happens. Perhaps not in the same way but,once therr wasn't any pre-agreed sharing formula amongst gamblers, there would always be one person who would sort out means to cheat the other with some entitlement argument like we have in OP.
In the real sense, it's wrong of the account owner to seek a lion share in this as, it wasn't agreed upon, the risk was equaly shared and as much as they would have had to carry equal amount to a lose, same ideology should follow instances of profit.

I don't see a reason why i would go physical while gambling as my model for gambling is very simple although, I would hate to discover that I was being cheated on a good bet.