Nobody is tighter with money than people with a whole lot of it, they always trying to pay less, or nothing, where possible. I'm sure he is disgusted and probably barking on his lawyers to do something about this right now. 300k a month? Who needs that? The court system is insane.
Marriage is becoming an outdated institution in general...if you're a rich man it's almost idiotic, all things considered. If you can't be with someone forever without a ring then you're phony and you care too much about other people's opinions, and/or tradition.