A lot of this is just due to the Reformation I imagine. If you want to become a corrupt greedy preacher, why do so in a church that requires their priests to take a vow of poverty? Pre-Reformation, those who wanted to grift joined the Church and found various excuses to get around vows of poverty. But in many Protestant churches, there is no vow of poverty to have to work around.
A lot of this is just due to the Reformation I imagine. If you want to become a corrupt greedy preacher, why do so in a church that requires their priests to take a vow of poverty? Pre-Reformation, those who wanted to grift joined the Church and found various excuses to get around vows of poverty. But in many Protestant churches, there is no vow of poverty to have to work around.