Rick,
Since I posted a couple of articles on art case pianos, I think I need to respond to this, although I may not be a typical case. This art case piano tick of mine is just a temporary infatuation (although a genuine one!), i.e. if the time comes to really buy another piano, I'm positive I'd buy a musical instrument first and foremost.
On the expensive sub 5' piano issue itself, I once played the Yamaha model that was more expensive than the longer than 5' Yamaha pianos (although not ultra expensive). Can't say that I was impressed, but then, I don't really like the Yamaha sound because of pure personal preference.
On the ultra expensive ornate coffee table issue, the Faust Harrison web site has a position statement on the issue (although it is also trying to market 'old wood makes better music'

. Moreover, there is an article from the author of the Steinway saga book on the very high end rebuilding market, posted on the 'good living' web site, I once posted the URL, but I can't find it right now.