ONE - Shows the value of going around the place and putting closers on slamming doors, fixing loud toilets, sound-proofing "thin" walls, etc.
TWO - Probably not a bad idea to have something for the person who bring up that they "expected something" without giving something to everyone. Also...
Depends. I have seen a fair number of negative reviews when things were NOT left, and were expected. Not really the anniversary-birthday thing, but things like water, cookie, whatever on checkin (etc.)