How much should a nanny be paid?

Will be nannying out of my home. I feel like 10 an hour would be fair since that’s what I’ve paid my sitters. But why is it they keep wanting a daily rate of 35-50 I mean is it really worth an 8-4 Monday through Friday. I’m a stay at home mom so I am not desperate but I feel like 50 a day to tie me home for the week isn’t a whole lot