I am a selector, partly by habit/something to do, and partly to track position, especially in wider formats. Newspapers are in columns for a reason! On one site I frequent, it took me a minute to figure out why I kept going to random other websites. I was keeping the mouse out of the way on the (rather large) margins, and apparently the full screen border ad was clickable anywhere that wasn't the center content column or navigation. Just blank space down the page, but I'd click it to select rows of text, and get carted off to the ad website. I suppose that's one way to monetize a strange habit...