You think so? I've been thinking about it. I'm a big Amazon purchaser as well (can't get away from the computer), but I also buy a lot thru their affiliates. Might not be worth it if I'm gonna get creamed on shipping on everything else.
Oh, it's worth it. $80 for a year? Buy 8 things from Amazon and you've gotten your money back.
Plus you can add four other people to your membership for no charge.