The link says "buy a kindle". It's pretty obvious where the link goes. Why would you care if he gets commission on it?
That said, most likely this particular post is a genuine complaint plus an opportunistic idea.
If it weren't someone that we all know, then that might be an issue. But Jesse has been around the hacker and entrepreneurial community for a long time, and has a reputation to uphold. If you've been to OSCON, YAPC, etc. you've probably seen him speak and possibly met him. He's not some random dude trying to cash in on this new-fangled Internet thing.
[edit] I mean human-generated writing, of course. . .