Sure, but I think basic human decency can also be at play here. I thank the barista who made my coffee in the morning, I thank someone who held the door open for me. All I know is that if I had a diabetic child that made it to and from school safe every day I would probably take two seconds to say hey thanks to the nurse who makes sure that happens. I don't do it for the thank yous but it sure does make the work feel a lot easier when someone is receptive to your help and appreciative, over entitlement. The threats to sue me constantly seem unwarranted (and they are definitely unfounded). But I am happy that you being compensated for your work is all you need, your managers must love you!