I didn’t see anyone specifically address this, but it is possible that your ex (and many in his profession) may never make that amount of money again in their lives. At the peak of the tech boom (for me, this was Q4 2000), companies were just throwing work out to anyone — I got (practically) whatever rate I wanted, and they would accommodate (practically) any terms I asked for. While business has been brisk since ’05, I have yet to have a month that billed half of what I could get at the peak. The frenzied atmosphere of the boom is gone — and actually I prefer it this way.
I am 100% for child support and 100% against alimony. I despise the whole concept of royalties and alimony is basically a royalty for marrying “up”.