How much child support do rich kids really need?

Custody News:
I was reading an excerpt from, I believe, Forbes magazine here http://www.financialpost.com/reports/story.html?id=433659, and I came away wondering, if billionaire Ron Perelman can “feed his daughter on $3 per day,” as the article claims he said, why then would the very wealthy require such huge child support payouts?
Or is that the wrong question in this scenario?