It's fair to say that Bang & Olufsen has never been too concerned about making the speakers it produces in any way "reasonably priced". In fact, I'd be surprised if cost even made the list of considerations when the idea of the Beosound A5 was bounced around B&O HQ.
Bang & Olufsen Beosound A5 review: Sounds expensive
How much is too much to spend on a portable speaker?