A piano teacher and I were talking about this one day quite a number of years ago. He has a Steinway D that he got rebuilt sometime in the 1970s. The piano then cost him $4,100. Yes, $4 grand! The same piano today is in the $50K range. even in the 1980s, Steinway grands were always expensive, but not as crazy as they are today.
Not counting inflation, what is the reason? It's a Steinway. Steinway is a name that even non piano owners know, and the wealthiest of the wealthy have to own one. They also consider these an investment like fine wine and other things to buy and keep. The sad part is hardly any of these people are pianists or have a real interest in music. These people are instead very wealthy, investors, doctors, lawyers and others that must have a Steinway above all other models.
These pianos aren't played like we would play them. The pianos instead become features as part of their decor because they look pretty in front of the big picture window. If the pianos are played at all, they're played maybe by the kids for a few lessons, and then occasionally during social gatherings and holidays. In most of the homes I visited, the pianos sat there with the lid closed up and covered with family pictures and other junk. In others, the lid is permanently left up on the prop stick so that it looks impressive. I mentioned to one of the owners that it's not good to do that all the time because the lid will warp. The answer I got was: "Tell that to my wife. She does the decorating around here".
Sad.