Vehicles: Why do motorcycles retain their resale value ?

[cbelt3]

I'll also note that 'custom' motorcycles appear to drop even more catastrophically. We have a guy at work who was trying to 'trade' a $50K custom chopper for cash or a mint 60's muscle car.. I think a Roadrunner ? He's now asking $20K for it. I don't think he's gonna get it.