Why is the market for used Levinson amps so slow?

Not sure where our OP got his info, but my ML stuff sells quickly and for premoe dollars.
I've had many generations of the stuff and have always had great service and at exceptable prices.

I don't think we have established that there is a problem. I've owned seven ML components in the past 15 years and have had no reliability problems, other than when two fuses blew in a power amp, do to my own incompetence. I recently traded up a #431 for a #532, the #431 was sold before it arrived at the dealers and for three quarters of the new price. Most of the responses above seem to be speculation rather than facts.
One other thing to consider is that back in the day, there were three undisputed high end brands Levinson, Krell and Roland, there was much controversy about which was number one but it was always one of the three. Now there are more great brands that you could name.

Charles1dad,,, I have heard of some problems with the 300 series and as you said not everyone had this problem, infact I might suggest that only a few had a problem. My #332 was 10 years old when I sold it to a friend, it's still working without issue. Also had two friends with the same series that had no issues, sometimes things just get blown out of proportion, the internet hasn't helped.
It probably helped that the units in question were not turned off.

Jmcgrogan2,,, there were no doubt many other great brands, but if you asked 9 out of ten audiophiles what were the top three brands you would get that response. Rightly or wrongly so.

Maybe it's a geographical thing, Threshold was not well known around here.

Sgr,, I apologize if my responses upset you , it was not my intention. I am not questioning your experiences, your posts sound very credible and true. But our experiences with ML are quite different, I hope you can see and respect that.

Abruce,,, I'd first take it to someone locally for an evaluation. Our local ML dealer as an in house tech and can fix most problems inexpensively.