Do you mean to say that the clients that become close enough to be considered "friends" to you in the way you describe above, that you do or do not charge them to spend time together in a non-sexual context? And that you only charge them for sex, or something?
I don't charge them for social time. They are friends that happen to pay for sex with me. If we meet up for a coffee or lunch then of course I wouldn't charge or even think about charging them. They became friends as I enjoy their company so why would I charge to spend time doing that.
The sex part is totally different as they are not the type of man I would ever choose in my sexual life for many reasons including the fact that I don't fancy them in the slightest and the age difference is so large so they pay for that