I host very small-time sites for a few family members on S3 because it is practically free (pennies per month) and there's more or less zero chance some script kiddie will break in and deface it, as was the case when they were going the traditional "php/wordpress on godaddy" route. EC2 is great but for hosting tiny non-money-making sites it's way more expensive and maintenance consuming, a micro comes out to $14 a month and a small comes out to $46 a month. For a site that gets hit a few hundred times a week tops, you're just paying for tons of idle time. A very rare 500 error (I've never seen that before) is not an issue in this case.