A fine (or in this case settlement) has to be somewhat painful in order to deter. I remember a story about Steve Jobs never getting a license plate and always parking in spaces reserved for disabled people, and so on. He just ate the fines and continued the behavior because they were trivial to someone with his fortune.
If OP's numbers are correct, the fine in this case amounts to 0.015% of assets under management--far lower than what anyone would pay a money manager to manage their investments. I'm sure no other potential violator would feel it necessary to change their behavior if they knew their penalty was 0.015%.