I can't imagine the CAA is doing this for the cash raised through fines. The amounts quoted here wouldn't fund the Belgrano canteen for more than a week!
Presumably their actions are meant to be a deterrent to bad behaviour, and I suspect a lot of the deterrent is non-financial. One of these prosecutions took place four years after the offence. That's a long time not to sleep at night, especially if the prosecution might trigger litigation.
Just commenting in general: I know nothing of the specifics here.