[rodneym]

Jim,
Just because a bubble may (or may not) burst, that doesn't mean their relative values get zeroed out.
Has this ever happened, anywhere? Any product?

A rising tide lifts all boats (and visa versa). Values may drop but it's my contention that the brands' values will remain relative to what they are today.
That's absolutely not a dig on any brand, BB vs SB, blah, blah, blah.