That could be the point of celebrating the BitcoinPizzaDay. I read somewhere like some miner listed bitcoins on ebay but failed to get any buyer. But I feel that listing might have served as a promotion for bitcoin, like many people might have gone for searching google about bitcoins even they were not interested to buy at that times. That kind of listing and 10k BTC for 2 pizza are the things which worked in a way to promote bitcoins to rest of people and those things helped to be where we are today.

I love bitcoins and I believe into million dollar value for bitcoins still I needed to sell some bitcoins time to time for various reasons. Satoshi and Winklevoss brothers must be too great in this regard as they never opted to sell any of their stash.