She's "contributing" by "working" for 6 years, not earning any money, and using savings. I can't imagine having kids that age and not contributing financially by actually working a job that earns some money for the family.
I am mother to 2, I was actually a SAHM for a decade, during which time I did everything related to keeping the home running -- all the cooking, grocery shopping and meal planning, cleaning, finances, appointments, kid stuff, car maintenance, etc. etc. That was my job, and I contributed just as much time and energy as my husband.
And THEN, once my kids were in school the full day, guess what, I went back to work full time. Earning a salary ----not day trading, not earning nothing, and using savings as my "contribution", like this OP's wife.
Of course I would stay with a man like the OP, who would like a partner who works a job that earns income, because I'm not an entitled woman who believes she doesn't have to work at a job that actually EARNS MONEY.
All of the other SAHMs I knew when I was one went back to work once their kids were in first or second grade, too. All of them!!! Well, one one works part time because she has MS.