I'm not sure if I'm allowed to post here since I played the P3 at Pintastic and not CAX, but playing it in person makes you realize how amazing it is and that every video you've ever seen of the game is only a tiny percentage of the real, in-person experience.
I liken it to a Tivo/DVR before they were commonplace; if you've never owned one, you can't understand why you need it... "I have a VCR, what's the big deal?" Once you've used it for a little while, you get it. Then you're forced to be one of those folks trying to convince people who haven't used it that it's great. Put simply, you need to experience it to fully understand it.
The price point issue is a tough one. On the one hand, $10k is a lot of money. On the other hand, it's $10k for two games, on a revolutionary platform. Moreover, it's only "nominally" more that the LE version of MMr, and that thing sold like hotcakes.
While "he who shall not be named" would stop someone from releasing a P3 add-on game called, say, Attack from the Fourth Planet (that reproduces the layout and expands the ruleset to fully leverage the P3), the more important point isn't that there is no technical limitation preventing such a game from being created on the P3. And really, that's just the tip of the iceberg...