So they were trying to steal 7 billion(spoiler)
And yet that idiot Bob was still so greedy that he had to double cross everyone to try and keep it all? He was already getting an equal share, as was his wife, so why risk a cut worth a couple billion just to get a few more.
You already went passed a ludicrous amount of money two zero's ago. There was no upside to screwing everyone and potentially losing all(which he did).