I like to have some emotional attachment to the woman. So I see a small circle of ladies whom I like and get on with well, and who seem to like seeing me. But girls come and go. They drift in and out of the profession. Some stay quite a long time. Most don't. So you have to accept that the "hire period" will come to an end sooner or later. There's a place I go where several of the girls float my boat. I said to one of then that they all seemed to enjoy their work, and got the answer "Of course we do! We're all fuckin' single parents, aren't we!?"
In other words, they needed the money, and we're earning it in a way they enjoyed.
It is one of the reasons why, if I see "age 19" (or whatever) on a profile, I move on: somebody as young as that (and, yes, I know it's a lie, but gives a general idea of her age) is clearly only doing it for the money, as she can (one hopes) get all the free sex she wants.
So, to sum up. I like to feel something for the woman, but I have never felt that any WG (or any I have met so far) could ever be a permanent partner. The most they could be is a "bad habit".