I don't mess with guitars.
IMO, unless you know the product inside and out, then stay the fuck away from the high end. Good way to get hammered.
I'd like to get into precious stones, but afraid I will get fucked. Cars I know, and they are fairly easy to evaluate.
What is happening now is insane. I could get all the 993 Turbos I wanted at 70k 2-3 years ago, and they are reaching a 1/4 million.
Let a good (insert disaster here) happen, and whoever is holding tons of inventory, will be crushed.