Uncommon, I suppose, but we don't tip. The last 4 years in a row we've stayed 9 nights at Wilderness Lodge. We tip bell services, but not Mousekeeping.
We call Mousekeeping after we first get to our room and let them know we won't be needing housekeeping services during our stay. Leave our DND sign on too in case there is a communication problem. One or two times, we spot a Mousekeeper in the hallway and ask for some tissues and coffee, but that's it. We bring our own towels, toilet paper, soap, etc. etc. and our own trash bags, which we empty ourselves.
Do this for several reasons really. We've never felt it was necessary to have the room cleaned because we keep it relatively neat ourselves, plus we bring so much of our own stuff anyway. Besides that, I have always had concerns about employees going through my stuff. Not at Disney, but one time when I was little, I remember my parents and I heading to our room wherever we were staying, and we passed an open room a housekeeper was cleaning. She was digging through the visitor's makeup case and opening things to (at least) look at them!

That alone made me never want to use housekeeping services anywhere when I got older, unless it was an emergency!