Even S3 outgoing price are ridiculously expensive for any kind of significant bandwidth use, that's what CDN are for (and in that area, cloudfront is really not cheap either). I'm a fan of AWS and use a lot of their services, but their bandwith price from them to the outside world are far from the best deal (of course if your bandwith is still calculated in the hundreds of dollars this doesn't apply/matter much).

I know you weren't saying the contrary, but still I wanted to point it out.