Hacker News Reader

I believe I saw something about Posterous adding affiliate codes to links unless you already have one on there.

http://news.ycombinator.com/item?id=1309403 "Posterous silently changes all external links to affiliate links"

Can this generate enough revenue to run the service?

I don't think so, but I also know that judicious use of caching and Amazon S3 can keep your costs relatively low.