Escort services are simply prostitution by another name -- mutton dressed up as lamb. They only serve to make palatable what it unquestionably unacceptable behaviour, and so lend weight to arguments for the decriminalization of all forms of prostitution.
Prostitutes and client have to meet. If the law is enforced too severely against those who provide such services (escort agencies, bogus clubs, massage parlours) the prostitutes who use them will have to find other ways of meeting clients, inevitably causing more public nuisance and supporting harder criminal activities.