Seems like few music stores carry arranger keyboards. They mostly carry Motif, some Roland Synths etc. Talking with folks in the music stores (Wash, DC, Albuquerque, NM), they don't sell very many arrangers compared to Motifs etc.

I've spent hours comparing the Ketron to Pa3x and Tyros 4 watching youtube videos. While the audio is not great quality, when I hear the Audya there is a very noticable difference. I've even shown it to others who instantly recognize the difference. Audya sounds much better!

As far as resale, I think any piece of electronic equipment takes a hit. I've seen this with Yamaha, Korg and others on ebay and Craigslist.