Not so sure with the AC/DC comparison - one is legendary, and the other is a Stern, and can be rereleased (licence permitting).

As for BBB, the original protos don't appear to have suffered the rapid price decline predicted by the naysayers they thought would occur when the reissue came about. One sold recently for reportedly $30k.

As for the repros, they have gathered their own almost legendary status, and are likely to hold their value ok I suspect.