Well, I was fed up with the absurd host prices here in Brazil when I got to know AWS and the pay-as-you-go policy.
I recently started a course for the solution architect certification (SAA2), that's when I saw in the EC2 module that machines must be turned on/off/rebooted manually which worried me because I thought the way it charged was: If there are users accessing the machine it will be running then you will be charged, otherwise the machines will not run and you will not be charged.
So is only the machine running on access counted or will there always be 730H of use? This worries me because AWS postgre hosting is expensive for us Brazilians, and maybe that kills our small business.