This tipping thing is way outta control. If I ever came back from a trip and filled out an expense report stating $3-5/day tip for a maid (or chambermaid etc) my boss would make certain each and every trip from that instance on would have me staying in a Bates Motel, a really old Motel 6, an Econo-slease etc. And he would instantly disallow that item, and I would have to redo the expense report. And ditto for anyone working for me.
As for "turndown service", I have actually viewed this nice practice as it occurred, and it never seemed to take more than 3-5 min/room. I can easily pull down my own sheets (I often do it at home).......but the occasional comp miniature of a tasty liquor is really a nice touch.
MisterNice