I think it would take two very special people to make it work.
For someone to fall in love with a provider would probably mean that she really does an incredible job, and I am not talking just about the sex. She would have to be someone who opened up to her clients and really put part of herself into every encounter. Of course, this assumes that the two people met as client/rpovider, not outside the biz.
Most men, myself probably included, would not be able to handle this. It is one thing knowing that your wife is having sex with other men. That people could probably handle, but when she gives of herself in that fashion to almost every client, that I think would be the thing that guys could not handle.
Now, if she was to leave the biz, as other say, would she be happy? I know if my wife told me I could not pursue my chosen career I would not be happy. And, in this case, would she be sexually satisfied by one man now?
On the other hand, I agree with Tank that a lady who was/is a provider has a very healthy understanding of the differences and similarities between sex and love. It would not surprise me if women who have been in the biz turn out to be some of the most living and passionate wifes out there because of this.
Very complicated. All this thinking is making my head hurt