No, the greediest monarch is the most likely to get assassinated, because they take too much from their nobles and everyone else. All the money in the world doe

No, the greediest monarch is the most likely to get assassinated, because they take too much from their nobles and everyone else. All the money in the world doesn't help a noble who is so greedy they piss off all their potential allies, or all their peasants. And if you were a noble who overthrew a monarch - with familial ties to enough influential nobles - because someone else has more money, you'd still be dead in all likelihood. And so on and so on. All these relationships were incredibly important to the power dynamics, and you don't get to redefine "greedy" as "greedy, except those who are too greedy to properly play the political game". Greedy monarchs didn't last, and the greediest non-monarch-rich were unlikely to have enough allies to become dangerous.