What incentive is there to keep working at a 90% tax burden?
Why do people volunteer for free?
The Beatles' "Taxman" refers to a 95% tax rate that they were complaining about. Yet they still went on to produce more records and earn more money (and yes, work).
If someone has enough money to live a life of luxury, they'll keep doing what they do to earn that life of luxury.
I imagine it could be more than a relic of the misogynistic past. It could also be in recognition of the misogynistic present, where women may not have all the same opportunities available to them as men in certain industries.