the premiums associated with Bitcoin collectibles is unheard of.
I think a lot of this is to do with the wealth effect. I also think physical bitcoin collectors generally think 1BTC = 1BTC regardless of the current USD value. So the premiums in USD are much higher today but in terms of BTC they're pretty much the same (BTCC 1BTC has a .15BTC premium for example)
I think the premiums measured in USD are going to get even crazier if BTC goes to the moon.