>In every other area of society, if someone is very good at arranging things to achieve some widely valued goal, we think it's OK for them to get rich.

This isn't very true. I am OK with people getting rich providing non-essential but much liked X to those with the spare resources.

I am not OK with people getting rich by rent-seeking limited essential resources or perverse incentives.

The societal goal of imprisonment should be minimizing population and cost to society. The financial goal would be maximizing population and minimizing cost to imprison. The societal and financial goals are very much in conflict.