I agree that percent of revenue is a much better metric to base these kinds of fines off of, but not without reservations -- a small company with high sales revenue but razor thin margin could get killed by a % revenue fine; this seems unfair to the little guy.

On the other hand, if the fine is % income or anything but % gross receipts, then of course the system will be gamed endlessly by accountants and lawyers to show the smallest possible net number. The end result might be worse than a fixed fine. So % of revenue it is.