Joe, there were several setups that sold on Ebay for $20-22K so it wasn't a single occurance.
Phil, I'm not arguing that crossram prices will come down and haven't already come down. I totally agree that they will not stay at $20K and we are already seeing that. But I think they will stay in the $12-15K range for real GM setups and the repos will sell for around $5K IMO.
The crazy thing about some of the NOS parts is that they don't look or fit like the original assembly line parts but people will still pay top dollar to keep their car all GM. That is part of the challenge in restoring a car.