Not exactly, but small thoughtful gestures matter.. I do not send thank you texts after sessions. I have a different dynamic than most people, and for the people I see I know who they are, I know where they live, in some cases I know their families and I know how to reach them directly via phone/email. I send presents for birthdays, I send them messages when I see things that remind me of them, I occasionally send flowers or pick up some small thing that I know they'll like. I never really do anything big, and it's certainly not all the time, but it's enough to let them know that I don't take them for granted as people and that I think of them in terms that don't always revolve around sex, even though that's what the relationships may be principally (but not necessarily exclusively) based on. They do the same, although admitedly some of them are better at it than others. lol.
People like to know that they're appreciated, and it's not difficult to to express that or to be thoughtful in small ways, so why shouldn't you do so? It costs nothing to give someone a little boost and people in general share way more negative stuff than positive stuff. Somebody has to work to try to push the balance back the other way. I just don't think it should be done by rote because then it becomes less meaningful.