I had never heard of it either, except at higher end hotels. Like in Vegas. But for the Ramada, Comfort, Red Roof, or Motel 6. Never.
Then again. Other then change the linens, and empty out a garbage can, we don't make much of a mess.
That was one thing I really enjoyed about Europe. Not much tipping other then rounding up the check at a restaurant/gasthaus. Although I did get a attendant in a bathroom at one of the nicer restaurants in East Berlin to thank me in English when I gave him a 5 West German DM tip*. (It was the only coin I had in my pocket.)
*Which was, roughly $2.50. But at the then exchange rate of 18M to 1DM, a 90 East German Mark tip. Plus it was in a "hard" currency and not East German funny money.