Most of your favorite shopping sites will allow you to store credit card information in order to speed up the checkout process. Online retailers know this added feature not only saves customers time, but it also helps move a lot more "browsers" to actual buyers. It's a win-win for merchants. Unfortunately, the problem for consumers is that storing your credit card information on a retailer's servers leaves your personal credit card data at risk. How much risk? Well, here's a scary statistic for you.