Exactly - taking away freedom is really the only penalty you can apply to white collar crime, or the risk/reward would be grossly in favor of committing the crime - even income garnishments can't push you to absolute zero.
Before modern bankruptcy laws, it was common for people who owe a lot of money to go to debtor's prison (and this still happens in some parts of the world with more archaic legal systems). At a glance it may seem contradictory since locking someone up would probably preclude any chance the debtor might have to make money towards the debt but the optics of getting punished for wrongdoing is clearly more important here.
