That was my reasoning, at least to justify my collection to myself. But I'm finding it very difficult to bring myself to sell any of the saxophones, flutes, clarinets and mouthpieces. Do you collect mouthpieces too ?
Maybe it depends on where in the world you live, but that's not really my experience here in the UK over the last 25 years. With one or two exceptions I think I would struggle to get back what I paid for used saxophones by makers such as Buescher, Conn, Martin, Buffet Crampon, SML, Grafton, Olds and Keilwerth. The used Selmers seem to have done OK in terms of appreciating value and I'm not sure about Rampone, Yanagisawa and Yamaha.
Rhys