Are Bowers and Wilkins speakers overpriced?

I don't know about overpriced but that diamond tweeter is unlistenable, makes my ears want to bleed. Reminds me of a rabid cat chasing a mouse wearing ice skates on a blackboard.

All speakers are overpriced - way overpriced!

The trick is to find the discounts.

I just bought a pair of the best sounding speakers made at a $10,000 discount - about 50%.

Can’t share the type or source - must maintain the confidence - so, I can preserve the relationship.

But, it serves to make the point.

That’s a bummer you can’t appreciate the diamond tweeter. It’s pretty stunning when toned down a bit with tubes. I can’t get enough!

I don't think it's inappropriate to ask if speakers are overpriced, if you answer in relative, rather than absolute terms.
For instance, most new B&W's seem overpriced compared to several different models of used / vintage speakers.   I recently purchased a used pair of ADS 1290's that sound just as good (and perhaps better:  not as bright) as a pair of B&W 804's, at a fraction of the price.  

I liked my 803's.  Very natural sound. They had very good resale value too.