What fraction of your traffic comes from those 3-5K-word articles? And what's your return on investment from those compared to, e.g., one of the pages that Aaro

What fraction of your traffic comes from those 3-5K-word articles? And what's your return on investment from those compared to, e.g., one of the pages that Aaron linked? I'm curious! I'm in the content-creation business, and if what you're doing works, I'll either need to radically change what I do or to start copying you.