There are things that I personally ignore when surfing an audiomarket for upgrade:
Cables: Monster cable, MIT, Transparent.
Amps: OCM, Belles, Anthem, Jolida, Parasound, SETs
CD-players: Rega Planet above $300
Speakers: Talon Khorus, Martin Logans., any Horn speakers.
I can continue that list with some analogue gear but I'm not willing to place everything onto the Hall of Shame -- It's just my personal taboos.