I would probably be more interested in stuff like stage sets etc. The sort of people who have the money but lack of personal initiative to end up hiring an interior designer for their house tend to be a total pain in the arse.
I do sell some stuff online, mostly 60s/70s craft stuff.
I used to get Russian cameras from my work trips to former Iron Curtain countries and clean them up/fix some stuff and sell them on ebay, but I stopped doing that because there are so many idiots around. I had a long saga with a guy who had bought this impressive looking Russian camera from the 50s that is a total pain to use. I had made it clear in the listing that this camera is a pain, but also has a lovely lens (included some photos I took), and included a pdf of the English instructions. He couldn’t work it, and claimed it was broken, and tried to get a refund without sending the camera back, and I had to hassle to get him to send it back, specifying that all the accessories had to be there.
The whole thing took about four months, cost me money in sending it special delivery, and endless time with emails and outsourced ebay staff with very low levels of English, and was a complete pain in the arse. When I got the camera back in the end, it wasn’t broken at all.