She herself is probably $10K an hour starting so this is honestly quite a steal.
That said, women who demand this will cost more than $50K a month. That's just the allowance Ayisha is talking about. I expect to spend a lot more than that on her for dinner dates, vacations, etc. that I, and I alone, will have to pay for.
And if her allowance dries up by day 20...guess who she's calling up for more money? And if you don't pay up? She will break things off.