it's all about the feel, the look, the prestige of a grand piano, which nothing else matches ...
JMHO

In the 70s when I worked for Avery Piano Providence in the sales department I once had a customer who came in purchased a high gloss off white 5 foot 1 baby grand. No one in the home played piano, he bought it for the look and prestiege. The guy never even flinched at the retail price. He did insist though that we give him a piece or 2 of sheet music so he could dsiplay it on the music rack of the piano.

JMHO but I think thats an outrageous price for a digital piano in a wood case. The manufactures seem to try to take advantage of the home player market.
A good alternative is to roll you own. Get a case and put whatever keyboard and sound system you want in it.
Here's just one of many who offer cases. http://www.grandillusionpianoshells.com

Theres even shell for pro guys who play two keyboards but want that B3 look. Portable too.