Yes, good relationships are a chore to find or build.You raise an important point. There is never any certainty with any relationship. Meeting someone as a client and turning them into a love interest is very difficult. I would think that it is MUCH MUCH harder for an escort/client relationship to evolve into true love than it would be almost any other way of meeting.
In my relationship with Loki it was very difficult to get over the "dirty old man" / "gold digger" stereotypes. It took some very difficult and brave actions on both our parts to get over the way we met and our age differences. We also had to adapt to each others needs.
None the less, it is foolish to assume any relationship can get serious until people spend a lot of time together. If someone told me he loved me after only spending a few dozen hours with me, I would assume he was someone to avoid. At best a misfit that had little or no experience with life.
If a customer says he loves you, he's not necessarily a misfit but someone overjoyed with the high of the moment.