Oh, please! There's no way to get the data required to do any real statistics work on this. Not without doing a hell of a lot more work than is worth for an HN post.
My simplistic 5% = 100 million calc serves to simply highlight that small numbers can mean huge problems. Even if I am off by an order of magnitude this is still a huge number of searches per month that are potentially sending people to entirely the wrong place, if at all.
