Interviewing docs don't see a dime! At least at my institution anyway. Where do you get your delusions? Your application money does not trickle down to the interviewing docs. They are not compensated at all for their time, with the exception of a possible free lunch.
And who says most people interviewing for a job don't send thank you's? Maybe not at macdonalds, but at real jobs I know they do.
What bothers me is this sense of entitlement you all seem to have. You are not the center of the universe and in this society people have a need to interact with each other and rely on one another. If you don't see that, then I fear for the future state of medicine and the world in general. Fortunately I know that at least right now you are in the minority and perhaps you may one day learn the values of courtesy, professionalism, and living in a society. If you want to be respected, you must show respect. That is what I meant by the "if you have to ask, you're not ready to know" statment.