I haven’t seen any of those ads here either. I don’t think I ever saw $50/hour on Backpage. If I had I would have questioned their validity, and I think most other clients would too.
I agree with what others have already said here. Women are free to set their prices. Low prices do not necessarily show disrespect toward the hobby. Like all clients, I appreciate low prices. But more than that, I appreciate high value, and I’m willing to pay for that if I can afford it.