I have my regulars, I love my regulars, and, particularly now, I look forward so much to seeing them again.
That said, the best performances come from those of them who I do see again and again, but not on a predictable basis. They know I like them, they know I will treat them well but they also know I am essentially a 'butterfly' and that they have to compete for my time (and money!). That keeps them keen and anxious to please.
Sexually I do less well with my either my long, long-times (effectively holiday live-ins) and almost predictable daily short-times, they can easily get lazy and blaze and stop trying so hard, but I am, at least partially, compensated by their companionship which I often crave as much as the sex itself.