AWS wouldn't stay on top for long. pretty soon MSFT, ORCL are going to eat AMZN 's lunch. they will use their in house technologies to outcompete with Amazon AWS. AMZN will force to pay premium for the technologies. AMZN is not going to invest million of dollars to re-invent the wheel (the IT technologies).
there's no uniqueness about AMZN business. it seems almost everyone could replicate. I think Sears and Target, JP Penney have been managed by dinosaurs.
beerntrading - I read a article a long time ago. it featured a guy who day traded drunk. believe it or not he made money

[being drunk made him fearless]. If I have time I'll look it up for you.