Like everything else, in turn the old hobby stuff eventually looses it's value....
Like Lionel toy trains....really popular 25 years ago....today worth maybe 10% of the prices WE paid.....I was a member of Train Collectors Assn......and once every 3 months a local group met up at alternate member's homes.....went on like that until I moved south, having sold off my collection and broke even on it.....however that amp for ~150 bux.....you don't need a gun.....