You're probably right about justifying the cost. The Audya has a lot of features that are really good for live playing. Lots of controls, both static and interactive. No need for mixer, pc, harmonizer, etc. On-the-fly style adjustment and quick saving of registrations, as good or better than the Roland. The new user interfaces are really great for auditioning new styles and songs.
There's a lot to like. I feel the new pianos are really great. I like the 6-button foot switch. A lot of what I like about the Audya has to do with comfort and versatility during live play.
As for the Bose, I get more good comments from the younger (maybe 22-40) as the older set. I thing it's because they are more aware of and appreciative of new technology.
The sound is good throughout the spectrum.
It's easy to tweak if you aren't hearing enough of a frequency you want.
I must admit, I much prefer having two of them. Again this is more for me than for the audience.
I'm surely somewhat nearing the end of my career, at age 66, so why not use what I consider the best? If the Audya doesn't prove to be that, I'll go exploring again.
I won't go back to Yamaha until they improve the drums. Roland seems to be dead in the water, at least for now, although I do enjoy their sounds and styles. I didn't like the Korg OS, sound or style selection. Not much left for now.
After all a guy has to have a few tax deductions or end up giving it my favorite Uncle (Sam). Yes, I know Sam needs it, but it seems easy enough for him to just print another few billion to give away.
DonM