I always book a massage with Marc when he's in NYC, and I've been seeing him for a few years now.
Marc is a very private person, and when you book a massage with him he is very upfront that a therapeutic massage is the only thing you're getting as part of the deal. Whether or not he warms up to you is more a matter of a personal connection (and for me has gotten better the more we got to know each other).
Anyway, I do think he is very hot and his massage is great. If you have the right expectations in mind you'll be happy with him.