The instance and bandwidth expenses are garbage compared to AWS.
True, but on app engine you don't have to worry about scaling, licenses, upgrades, etc. This is worth the extra cost to some.
> Huh? What are these people smoking?
> Also, why is it on Idle and not on, say, science?
I think you answered your own question.
The only possible interpretation of any research whatever in the `social sciences' is: some do, some don't. -- Ernest Rutherford