So, let's break it down to what it is, not what we wish it would be. Any SP has, as a defining note of their character, the made choice that they will do what they have to, to have a lifestyle they could not otherwise afford. Sure, I know, there is the odd exception that proves the rule. The university educated SP who could make more in the "real world" but chooses not to. For the vast majority, this just isn't the case. Everyone has an internal moral compass. It is not possible for that compass to only be skewed when it comes to one thing, it is skewed in regards to everything. To reduce it to it's most basic aspect, any decision that should be based in what the rest of society considers a morally correct decision, is overridden by " but I want".. They know that they should quit the business and move on, but there is always the " but I want" of a vacation, car, lifestyle, etc. "but I want". The collateral damage in the wake of " but I want" is usually your feelings. When looked at from the aspect of your now fave SP's future life plan outlook, "delayed gratification" are two words that are not in her vocabulary.
She also has to deal with the paradox of " moving on " .. Like it or not, first impressions are hard to change, and you will forever have started your relationship from the standpoint of a "trick". You paid for pussy. She wants a guy that wouldn'y pay for it, as nuts as that sounds. She will have a half conceived plan for her life for when she's "done" that will include meeting and developing a relationship with someone who isn't a trick, but she will not have worked out the logistics of how to explain why she has no friends ( you can't meet her friends from the biz, because she has lied and told you she was a waitress, and if you put a couple of glasses of wine into one her "biz" friends, sooner or later, the cat will be out of the bag!). She may actuall be able, for a short time, to pull off her explainations of a ten year gap in her employment history and her lack of friends. But sooner or later, it will bite her in the ass when her new SO takes her to a party and one of his friends pulls him aside and says " Hey, Bro... she's not a waitress... a couple of months ago, she blew half the guys at my cousin's stag!! " And at the end of the day, she will still have the underlying mentality of " but I want" and when she "wants" right and wrong will go right out the window. Right along with your feelings, because her " but I want" will ALWAYS come first, when push comes to shove.
Go ahead, date a SP... but do just that, date her and enjoy the ride. Understand that it is an affair to be enjoyed and savoured and cherished. Understand that if you take it too far, it won't have a pleasant ending, or be a cherished memory.