Pro Dommes seem to be a bit more numerous than outright professional subs - I've seen a few homepages for Dominatrixes but not a single one for a pro r/l submissive. I see it could be exciting - like Zesty I could never do it myself - but the risks of abuse or blackmail by cuistomers could be high and very hard to handle, especially if one were catering to people who are not regular and experienced bdsm'ers, and whom one doesn't know. When you offer a 2-3 hours session I suppose it's on a "no full-on sex basis" (no full intercourse, no deep throating, and so on) but how could you control that if you're bound and serving a client you have never met before?

For myself I think there's a big difference between doing a job with my hands or brain and offering up my body and privates to be used for wage work, but I accept this isn't such a sharp difference for everyone.

What follows is not aimed at you personally, ohmytalia, but more general:
"Sex workers" (~escorts) often claim "I can judge my customers, I never let myself be forced, the control stays with me and I love the job" but when it's said just like that, it sounds more like what you say to brush off any embarrassing and potentially degrading questions by "outsiders". If you are attacked, beaten up, raped and robbed, the police are not terribly likely to be able to find the assailant/s and get him (or them) to court, are they? It's not something that lands high on the priority list of cops who will often think "A hooker is a hooker, and what about this? even a masochist hooker?! Bah!"

Of course, if one has an efficient "safety net" protecting your personal security and meaning you don't have to accept any one customer whom you don't want, then it would be fine, but my feeling is some s/m "escorts"/subs (or ordinary 'sex suppliers' who sometimes drift into providing submissive 'kinky services' -bondage scenes, watersports, candle play etc) in a competitive market may not have that kind of reliable support network, and then they are forced to take big risks or just accept doing things they really find quite degrading.