I bought several top line stereo receivers around 6-7 years ago and some of the current prices (ebay, where else) have significantly increased from what I paid. I have a Pioneer SX-1250, Marantz 2385, Yamaha CR3020 and Toshiba SA-7150. The current Pioneer and Marantz receiver prices are almost 50% higher, on average, than what I paid. The Yamaha has increased about 15% and the Toshiba is about the same. It seems that the Marantz and Pioneer higher end components are increasing the most with Yamaha close behind. There are other good brands, but the increase is the most with Pioneer and Marantz. I am wondering if it would be a sane thing to do if I invested 10k-20k (or more) and buy a few Pioneer receivers (SX-1050, 1250), a few Marantz receivers (2325, 2330, 2385) and a few Yamaha receivers (CR1020, 2020). The 3020's are too rare. Even with restoration costs, I could conceivable make a nice return in 4-5 years. I know I could do okay in ETF fund investing, but I love being around beautiful classic stereo stuff. It is like an addiction, and I could do just as well as traditional investing. I am mainly into receivers, but good vintage speakers have also shown a huge increase in price during the last 6-7 years. I guess you could compare this to people who invest in collectable vintage cars.