Clearly people think that Amazon will take over the world -- literally -- and their only method of influencing their new overlord will be to have shares to vote

Clearly people think that Amazon will take over the world -- literally -- and their only method of influencing their new overlord will be to have shares to vote. That's a joke. Presumably the ultimate belief in the value is either that Bezos will eventually share some value of the company, or that Bezos will retire or die and it won't be his decision, or that stockholders will force a value-sharing over Bezos' objections (he does not, after all, have a majority).