CELESTION: SL12 – silly prices or what?

Was just thinking about how some speakers go for surprisingly really high prices on Ebay.. These Celestion SL12s for example - granted I've never seen them before apart from in an old magazine - currently at £620. Double bass driver versions of the SL6. Wouldn't an SL600 be better (allbeit without so much bass) at their regular price of £400? Is it just people hankering after something rare and different?"

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