Does anyone get this Quadruple thing? If you "register" for the Amex/Skymiles shopping bonus, it says "Holiday Earnings are here. Get in the Holiday spirit with incredible savings and top products from top brands and earn up to QUADRUPLE miles" I keep trying to review the fine print, but can't seem to find what "up to Quadruple" really means? Some merchants show 4 or even more than 4 bonus miles per dollar already, so where does the Quadruple thing come in? Is it saying that whatever I would qualify for normally, then they will quadruple it? Example: Spend $100 at Sears when they have the X4 per dollar promo on, so that's 400 miles. Is the Amex/Delta Skymiles shopping deal saying they will x4 that too (to 1600)? I also don't see where the "up to" thing comes into play. I am sure I must be missing it.