Well, I enjoy going to the spa for a massage and I usually can pick up a special that isn't a whole lot more than what I pay at home.
I don't mind the sales pitch as long as they take no for an answer the first time. I've never had to get past that point, but if it did, I would just grab my clothes, say "I'm out of here," and go to the restroom to change .After that, I would probably go to the receptionist, tell them what happened, and then reduce my tip.
But, I'm not easily intimidated and it wouldn't bother me at all to do that.