Trends in value of vintage / used audio equipment?

I usually like meters.  Sometimes they can be a bit overdone or underdone, but for the most part, I like them.....[typed as I stare at my MC2105.]

blue-green meters behind a smoke glass faceplate--what's not to like in terms of looks?

VU meters are useful, too, all the more so on amps with dodgy power claims (not the case with McIntosh, obviously).

Meters warn you the amp is getting kneecapped before it actually happens. Bob Carver always had the good sense to put meters on his amplifiers.

I’ve noticed a lot of high asking prices for vintage or near-vintage gear in recent years, especially with regard to turntables and speakers. Seems to be less common with amplifiers for whatever reason. 

Some vintage speakers that guys were scoring for $100/pair back in the 2010s are now being listed for $800 plus. 
 

I think this conversation would be interesting related to speakers.

Clearly higher speakers are incredibly overpriced as demonstrated by a used market which prices them at 50% of list after two or three years. And this is from a dealer who no doubt is paying 25% less than what they are trying to sell it for.

Speakers too terrible in the used market. An amplifier is a bit more rugged and handles time a lot better. Not sure how pricing of older tube versus solid-state amplifiers compares