Working women produce. Trophy wives spend wealth quite well, but let's face it. That wealth was going to get spent anyway, if not by the man who earned it, then by his descendants.
I wonder what effects of the residual wealth of a truly rich person would be without a wife to spend it all though. Perhaps all his children and their children would be forced to work for a living and produce if the wife blew all the money before they could get their grubby little paws on it. In that sense the trophy wife has created multiple productive individuals while the working woman can only be responsible for herself.