What brands tend to have the worst resale value?

I’ve bought only used gear for the last 15 years or so. I try to stick with brands I know will give me most, if not all of my money back when I resell It (eg McIntosh, Manley phono). Buying before listening to a component is a crapshoot, no matter how good the review is. The worst one for me was a wyred 4 sound integrated, STI-500 I think. I overpaid for it used, hated the sound, and promptly fried the left channel (don’t ask). After getting it repaired, I sold it after months of trying, and lost quite a few dollars on it.

Vapor Audio Prob the Worst, 75K Speaker not worth more than 10K in today's money.

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.