Well, that's why FlyerTalk is such a treasure...it opens our eyes to things around us that we weren't aware of.
I knew about the service charge (if that's what it's called) being added to the bill in restaurants in Europe. But I didn't know that no tip was expected in the room. It just never occurred to me.

As for the envelope left in your room telling you how much the housekeeper enjoyed servicing your room that day, I suspect that was just something management dreamed up to make the guest feel more welcome. Evidently it fell short of expectations.