Well, I'm sure Jan's glad he paid for a sponsorship in exchange for his posts being arbitarily deleted. For all the talk about an informative and honest community, when it came down to brass tacks, all that talk got tossed out the window. Jan's post was more informative than commercial, and a hell of a lot better written than Tyll's rants, not considering that English isn't even Jan's native language.
If a post like Jan's is subject to deletion, what's next? What if someone posts a bad review of a sponsored product? Of course, everyone is going to say that won't ever happen. But if informative, non-troll posts are subject to censorship, then the powers-that-be betters spell out exactly what the ground rules are, otherwise paranoia will poison the atmosphere of the forum.
I don't mind if a site "sells out." Heck, we all need to make a living. At least be honest and up-front about it, though. A better option would've been to lock the thread with a post from a moderator explaining why the post was against the rules. And the best option would've been to just left the damn post alone.