Sure. I'm not interested in high-quality appliances per se, it's just an example of something middle class people buy that poor people aren't really aware of.
The original question still stands: What do insanely wealthy people buy, that ordinary people know nothing about?
By the definition of the question I can't know the answer myself: I am "ordinary people" so I must know nothing about it. So what's left to me is to suggest parallels at the level I do know something about.
Another example of a "middle class thing", not related to things or appliances: services, in particular moving. I changed flats many times in my life, more than 10. I used to pack, load, unload and unpack everything by myself and at some point it started to take 2-3 days of my time full time. Then one time I contracted an end2end moving service (you just give them the keys) and I would never ever go back.
Recently a friend of mine was moving and asked to help to load the truck. After an hour of sweating I asked why he didn't contract someone -- this idea just never crossed his mind. A year later he was moving again and was grateful for the advice.
Surely, rich people enjoy services that would never cross my middle class mind? A governour for the child maybe? Well I would never know.