... it sells for what someone is prepared to pay.
...
-this!
If product is scarce, then one just need to accept the fact (pricing). But arranger keyboards aren't such products and so, normal "used market" applies.
Ok, few years old arranger can still be as new (if not abused) and when selling, owner only sees that side -especially if keyboard wasn't used much. I can understand, that nobody would like to lose too much money at selling. But fact is, it is not new. For example, when buying expensive item, every day of warranty counts. And there are other things to consider (return option, etc.), so buyer should know what's important for him and how desperate/patient he is.
I'm not looking for Genos, so just my opinion (if worth). Price for used Genos should be below $4000... closer to $3500 actually. Some might say "but new Genos is almost $6000"... -way overpriced, in my opinion. The thing is, for about $4500, one can get brand new latest Korg Pa5x. Is Yamaha's 5 years old model better? And here, everyone must decide for himself.
Just sharing my thoughts,
Bogdan