You're right about lots in dealers' showrooms, probably because Yamaha lean on them to take one in stock even when they had to almost give away the last one. Remember that, as far as Yamaha are concerned, sold to a dealer means SOLD even if it stays on the showroom floor - it makes no financial difference to Yamaha. The upside is that most dealers heavily discount S10s to get them off the floor. On the other hand, it doesn't do a lot of good to resale prices.
I did have the opportunity to discuss Yamaha's UK pricing hikes in the last few years (say 2008 onwards) with a Sales Executive and his explanation was that, being one of the smaller manufacturers, they were less able to absorb world increases in raw material prices and other effects of the recession so were forced to increase their prices sooner than the others. While it is true that the prices from other manufacturers have somewhat caught up, his story is blown by the fact that they have now reduced the prices again, current recession notwithstanding. Seems like a case of "keep the profit margins up" suddenly tempered by the realisation that there aren't ANY profits if you don't sell anything.
I can't see the point in "flash-mobbing" a BMW event. Everybody's free to make their choices of ride and I can't see why you'd want to be so confrontational. You're never going to convince them that they've made a poor decision about their ride, even if it is self-evident to us. I like the NEC Museum idea better.