I was just wondering the same after the 512/572 talk. Only discovering them relatively recently, I was feeling that they had an extraordinary brand/resale value considering where they've come from. But perhaps the passion is cooling, and the big watch crowd are heading en masse to Hublot?
That 572 really calls to me, though.
I'm really eyeing a 512 myself and the preowned market is only making things worse (or better depending on how you see things)