it isn't a hassle to us. We are encouraging you to see others also by giving you okays and putting you on a whitelist. These things you feel are tacky are the positive qualities that tell other providers that you are safe to see. You should be glad you have been placed on a whitelist and not a blacklist, if that maybe clears up the perspective for you.
Thank you notes from clients are appreciated, it also lets us know that you enjoyed your time and are interested in doing it again.
In this world of hobbying there are many levels of verification we providers use to decide if a client is safe to see or that we will see. Think of it as a compliment if you have been acknowledged in this way, alot of guys screw up so badly in the beginning that no one wants to see them.