I would be very much in favor of an end to for-profit prisons and other things like civil forfeitures. Giving law enforcement a cash incentive to lock up more people/seize more property is a horrible idea, that will obviously cause problems.
For example, society obviously needs to re-habilitate prisoners to reduce crime, but what incentive does a for-profit prison have to do this ? They make only make money when people go to prison.
And it gets even worse when you consider the impact on legislation, since the people who make money of crime hire pressure politicians to keep the money coming, which results in things like the war on drugs and mandatory sentencing laws.