I have regulars I have seen for years, it's not just about the sex for them, it's also a bit of company, some banter, the secure environment to talk openly about sex or the safety to try to fulfill their fantasies, some fantasies that they have harboured for many years but unfortunately they are not able to act out their fantasies with their partners. Some guys don't have partners or are widowed & they are lonely, so they like the company, the touchy-feely element.
If you are just going for the sex & don't strike up a rapport with the girls you are visiting, then it might at some stage become routine. But I would've thought that the fact that you can a have a choice of girl should offer some variety, every girl is different, her touch, her body, her personality, so the experience shouldn't be the same with every girl.
If you feel fed up, then yes it's best you leave the scene. It's no longer providing fulfillment so it's your time to move on.
Sandy x