There is an article here about that basically explains (this is my interpretation not his words) how the price of BTC is kindof like the sticker price on an item in the store. It doesn't represent the real value, it's simply the value as perceived by consumers and is, in a way, fixed -- http://falkvinge.net/2013/09/13/bitcoins-vast-overvaluation-...
But the fact that early adopters are psychotically rich for doing nothing is... one of the many signs of a flawed system. Basically if everyone started selling the market would destabilize because supply/demand curve would change & I'm pretty sure the value of what they're selling would plummet before they can unload most of their stack.
EDIT: Since I was immediately downvoted, please note that this happens regularly any time you speak ill of Bitcoin's pyramid scheme aspects and is completely expected/anticipated when I post these responses. It's a public service that I will drop eventually, but think about this -- even people who own a ton of BTC (article I linked to) criticize it as being insanely flawed. They only stay with it because as they point out, they believe the price will continue to rise. Speculators love it because they KNOW it's flawed, but still feel confident in a bet that the price will rise. I think it's why ultimately it will take gov intervention or a market catastrophe that screws over all the speculators to finally destroy such interest in Bitcoin and finally give it a chance to start over again... as a currency.