Personally I do not care about Amazon, and if Amazon has any real value; no one knows what it is.
Microsoft paid over eight billion for Skype, etc. etc. there is no way to value a diverse company like Amazon anyways.
The value in Amazon is not the company infrastructure; although that is very very valuable...
The Value in Amazon is its CEO and once such leadership is gone the people who replace them are just chair warmers...
Companies that size are like octopuses and need an overall strategy plan, once this CEO is gone amazon will still be a major player in clutter but it will just be another ordinary mega rich company of very little note nor interest.
None of this should take anything away from your excitement and enthusiasm for a little rags to riches bookstore success story...
I love Amazon, to suggest it is so valuable is simply creative accounting; but Jess Bezos is the only thing at Amazon worth considering...