What brands tend to have the worst resale value?

I I have classic Infinity speakers, never really liked the sound, spent money upgrading the internals, invested elbow grease refinishing the exterior and now they proudly sit in my basement waiting for someone to bite at my ridiculously low asking. Fishing in a Manhattan puddle yields more bites

The reasons are many for a product not holding value, with the most common being that the MSRP was too high and once the advertising hype is gone, the item is not so great anymore. 
Someone mentioned the Apt-Holman preamp and it was a great amp, which I enjoyed for many years, but the printed circuit boards were cheaply made causing the leads to lift.  I had mine repaired once, but PCB deterioration made further repair impossible, so I gave it to a fellow who had another.  Also, you can bad mouth Japanese gear if you want, but the reliability of their stuff was outstanding.

seanheis1, 

One of the many contributing factors that  has influenced the more traditional home audio solution is the home theaters in a box, sound bars, and the big sound Bluetooth speakers.  

I think some of the well designed  “vintage” gear can outperform the more modern equipment.  

Occasionally when family and friends ask me for audio equipment advice.  I usually recommend that they consider “vintage”equipment with the suggestion that they have it serviced.  

Emerald Physics. I have a great sounding pair, that short of giving them away,I can't seem to move.I have even greatly reduced the price to no avail.