I haven't checked my Amazon Author ranking in some time. It's actually an interesting, humbling experience. If you've been trying to sell books online, it's worth your time to check on it once in a while, especially if those books start selling to any degree. Right now, I'm ranked somewhere around 200,000th in the world? or America, I don't know.
The first image here shows my rankings for this year. You can see that I achieved my top ranking in the spring, which makes sense, since my top title is an ACT-prep kind of book. It seems I was in the top 50,000 for a fleeting day. Hooray for me! However, my ranking seems to be trending down over the year, so sucks for me. Really, you can't get too riled up over author ranking, but I would like to stay in the top 50,000 at some point. That would give my life some meaning, I suppose.