Audiophile slang
Upgraditis
Also called upgrade-itis, upgrade fever
Upgraditis is the compulsion to keep buying new gear in search of an improvement, whether or not one is needed or audible. It is diagnosed with affection on forums and is the main reason the used market is so well stocked.
The condition feeds on reviews, on the arrival of each new flagship and on the belief that the next purchase will be the one. Its usual outcomes are a shelf of sidegrades and a declared Endgame that lasts a season.
The standard remedies are to listen to music instead of gear for a while, to spend on recordings or room treatment rather than boxes, and to read the measurements before the marketing. None of them work reliably.