It really depends on what kind of hotel and where in the world it is.

What you say is true of Paris, Aman hotels, some Four Seasons properties, African safaris, most of the Maldives, and a handful of other places and hotel operators.

It's not true of many others, some of which are surprising: Mauritius, Vienna, much of Asia (esp Japan and Thailand), much of South America, most of India, a lot of Italy, and even French Polynesia.

Depends what you consider expensive of course. You're not going to find a 5-star hotel in London at £99 a night, no.

Then again, it's a 5-star hotel, so service will generally be good (and that is worth something in my view).