Is it worthwhile to have a arbitrary unrelated display ads on the blog of the proprietor of a commercial app? Seems bizarrely off-message. But I guess you could use instapaper to avoid the ad distraction.
Seeing as an aside/light hearted post like this makes it onto the HN front page, I'd say its a reasonable deal for the advertiser in terms of eyeballs/brand awareness, even if the HN audience is not their intended audience.