The technical sophistication of a camera, and our sentimental attachment to it bear no resemblance to its monetary value in most cases. This is especially true since the digital year zero that occurred around the millennium. Case in point, I sold a Canon AV-1 last year with lens. Both were exceptionally clean, and I'd replaced the light seals in the body. It produced excellent photographs and will continue to do for many years, but it was surplus to my requirements. The market value of AV-1 and 50mm 1.8 at auction was £18.00. The price of a takeaway meal. If the purchaser continues to use it I'm happy with the deal, but someone probably saved up for quite a while for that camera and certainly looked after it. Its real legacy will be the photographs it took, not whatever arbitrary value the market places upon it. Whenever you press the shutter, that view recedes into history never to return. You can't put a price on that.