B&O went up in tune with the increasing availability of easy credit, and crashed when that stopped being available, just like most things in the segment. One could claim that in the feeding frenzy period, when people were throwing money at everthing premium and willingly paying a lot, B&O didn't get the pay-off one would expect, as the share plateaued, where some other luxury providers outpaced the segment.
Stock moved up today, on light trading. A new fiscal year about to start, turning the page, and with the new CEO's policies beginning to take hold.
Here's the 5 year chart.