"Amazon ever "grows" into its valuation" I don't know about that: AMZN keeps growing bigger even before the earnings ahead.
The earings just can't keep up with the valuation growth: It's significantly outpacing it right now. That makes AMZN special. Other compnaies earings seem to outpace their valuation. Par of it is Bernanke loves AMZN for it's reading compnent as well. That can't be overlooked. It's obviously incredibly supported as reading is fundemental.