Is there a for-pay ask-the-expert type site which includes medical doctors offering their advice?

I don't know of one. I don't believe there can be such a thing. All the sites I've ever seen are free-for-service rather than fee-for-service. Did you want to pay or are you just curious?Is there a for-pay ask-the-expert type site which includes medical doctors offering their advice?
yes and you can google this question for the web address