But Alex, if there's no market established for "cheap" pre-owned BL5s, it means there are no/very few sellers. How can the speakers be rapidly losing its value, then? Unless, as Calvin points out, the dealers know something we don't. Highly unlikely...
On the contrary, the more a dealer would rotate the displayed speakers, the more he would create such a "cheap" market around him eroding his own potential profit margins on the items not sold at the new-item price.
For a B&O dealer it should not be a matter of death or life to accept the cost/depreciation of the displayed/demo speakers. After all, if new B&O would lose it's price rapidly when being sold further, then there clearly would be something wrong with the product/pricing etc. Now, it's not that such "aggressive" market approach would not work for some time, but it would indicate that B&O business would be similar to, say, car business which generally depends on volumes sold heavily . (Tellingly, Porsche in it's niche is the most profitable car manufacturer...)