Truth is, they have to have a LOT of power in order to sing. Many folks who purchase them don't really know actually how much power they truly need and they end up selling them off at an average [just by what I've seen over the years] of $600 or so dollars.
I had a Carver M1.5t and a 4.0t [probably more Carver amps at the time] trying to power them and for my listening preferences? They just didn't cut the cake. That said, I have heard them on a Lightstar amp and one of Bob's new tube amps and the playback performance was absolutely accurate and a joy to listen too.
Do you think that if one already had adequate power to amplify these bad boys properly that they would be worth more or are they "just" another speaker that folks flip through without ever realizing their true potential?
The best way to enjoy digital music reproduction is to never listen to a good analogue reproduction.