I enjoy watching dumb animal greed get bitchslapped by the Invisible Hand. Market forces at work, what's not to love?
Maybe the people who got in at <$10 and held the entire way through because they thought $600, $800, etc. wasn't enough -- waiting for $100k/btc or whatever ridiculous prices bulls we're calling for during the big rise -- could be considered greedy, but the guys who bought at those prices were actually quite generous in their donations to those who bought at single/low-doubles and had the sense to take profit along the way.