Economically I don't see the advantage to staying together with a high earner that quits their job. Take half, plus the 20% support (they'll have to work now because they'll be tossed in jail if they don't pay, and imputed income will be at their high professional salary), then you can find a new person who doesn't work outside the house and let them contribute their half with chores. The sooner the divorce the better as they'll have to go back to work after the judge's order. Versus just having a person who doesn't work outside the house without the 20% of an engineer salary income stream.
This all sounds really fucked up but realize over 18 years we're talking about possibly $1M+ (tax-free) on the table. People will do some crazy shit for a million dollars.