I have never had such a narrow stereotyped view of prostitution I think that view comes just as much from hollywood cop shows and movies as it does from church horrror stories.
I imagine with any profession there are many different levels of the business from the grimy to delux high-end and everything in between. Also, the reasons for getting into would be many and varied.
I can see there would circumstances in a person's life where it provides a useful service. Including the reasons cited lonelieness, depression etc disability would be another reason someone may avail themselves of such a service.