Rogue Audio hard to resell, has it fallen out of favor ?

You're selling something in a very narrow category. That includes an even smaller group of potential buyers.

Add to that those buyers are not the audio neurotic with money to burn. They will be Best Buy type looking for something "better" but not "high end."

I have something listed and have to face reality-lower the asking price to half or lower of MSRP to attract attention.

I’ve owned Rogue Audio throughout the years and their equipment is just barely hifi in quality.  Sold it and would probably not buy Rogue again because there are much better products for the same or less cost. 

That is why Rogue doesn’t sell well on the resell market. 

Traditionally Rogue’s lower price-tier true tube amps & preamps have held relatively good value. Their Class D hybrids are tougher on resale, as is their TOTL gear. It’s just market demands at play.

And if you take ASR seriously, then you should simply NEVR buy anything with a tube in it, EVER. There’s no overlap in those 2 audiences.