Adcom gfp 750....why so many for sale?

I love the GFP 750 I run it to a beefy Rotel 200 x 2 into either my Vienna Acoustics or Sonus Faber speakers with transparent audio cables. Set up is everything and if you need more bottom end because it doesn’t have a mega bass button just add a subwoofer to the second set of rca outs. I use a paradigm sub in my set up. The detail is amazing and I use it for 2 channel only. Super audio disk and flac files still sound awesome through this piece of equipment as long as you have a great player. “When it comes to surround sound and video equipment give me the latest and greatest. When it comes to 2 channel amps, preamps, and speakers for audio I just want it built like a tank.”