Since my answer to the question is requested: no, I wouldn't date a client, for many personal reasons which I don't feel like sharing here.
In addition to those personal reasons, I'm just not interested in doing the work it would take to successfully transform an SP/client relationship into a romantic relationship. If someone met me as Genevieve and grew found of me as Genevieve, no matter how much I also like him and enjoy his company, it's going to take work for both of us to adjust to a relationship where Genevieve is being replaced by the "real me". Genevieve is a fantasy: someone who of course is not completely unrelated to the "real me", but basically a fantasy, ideal version of the "real me". The "real me" is not always smiling, nice, and caring, she doesn't always want to have sex, she doesn't shave on her days off, she can be high maintenance and bitchy, she's often stressed out, she's not always willing to cater to her partner's every desires and needs, and she has needs of her own that she expects to be catered to as well. Basically, she's human, not a fantasy of a woman like Genevieve is.
I like my romantic relationship to be uncomplicated, simple, easy (as much as human relationships can be): starting one from an SP/client relationship is not my idea of an uncomplicated, simple, and easy start.