I've also noticed certain waves of products or brands for sale over time, which my best guess is someone lists a particular item, and then you see others follow suit and list theirs too in the hopes of selling for whatever reason. Certainly not unique to any component or brand.
Why Are There So Many Used Rogue ST-100's Being Offered For Sale?
Seems like used listings pop up every week, including from resellers. This has been going on for a while. A "dark" version was just listed today. I was contemplating picking one up, but now I'm doubtful that I will. I had read that there were transformer hum issues. Are there other issues?