There has already been a lot written about the recent study by eBay about paid search’s effectiveness for both brand keywords and non-brand keywords. Most of the posts, from Larry Kim’s on Search Engine Journal, to the recap from ppc management experts on Search Engine Watch seemed to focus on eBay’s historical and at times hysterically funny misuse of dynamic keyword insertion. I am not going to focus on those things or even point out that it didn’t work because they did PPC wrong.