Not sure I agree with this. I am a SAHM like @Iho . Also have a large mortgage free home, second home in London bought for cash recently, top of the range BMWs, luxury holidays etc. DH actually earns more currently than OP’s DH, but is employed so the window for his earning is smaller and will end when he retired in 5years or so.
We also have two kids who have been challenging in their own way with SEN needs so DH would not have been able to achieve the heights in his career and have a family without me supporting him - supporting them. Not something I could have done while juggling a job, either. It is me who has found each of our homes, planned the development/renovations, project managed them so that our homes doubled in value before each move so I have personally contributed to the increased value of our assets. As a result I feel very much that his wealth, his achievement, is also mine and am fortunate that he ardently feels the same.
Our children are finally settling, one belatedly arriving at uni and finding her feet/overcoming her MH issues. The thing my husband is most proud of as a couple is not his money, or his on paper wealth, the houses - it’s our children’s progress and achievements, the security of their futures, as it’s for them that he has worked so hard.
So, no, @Iho is not a ‘kept’ wife of a millionaire - such a comment is deeply misogynistic and fails to recognise the value of a female partner’s contribution to the marriage - she is an equal partner in the economic and social relationship that serves as the foundation of their family set up, which a divorce settlement would also support.