At least it's an extra data point to show we're not in a startup bubble. If we were, these stocks would be skyrocketing no matter how bad the company was doing.
http://www.mondaynote.com/wp-content/uploads/2012/05/Amazon-...
Does this look like a hugely profitable company to you?
[Apple will be an exception here, but they are a very rare case, almost every other growth company looks like Amazon].
I totally see your point (and agree) but there's an important distinction to make in Amazon's case, because there's a big difference between aggressively re-investing your profits into growth and aggressively burning other people's money to grow.
Have you accounted for general market trends? Seasonal cycles? Comparisons to other IPOs? Contrast with other types of companies that aren't part of your perceived bubble?