I see this type of refining activity on our payment gateway logs. I can only imagine what it looks like at a major online retailer or SAAS service. It just goes to show how fundamentally broken is payment card processing at the moment, and how ripe it is for disruption.
My guess is you're talking about the logs from your business site, Ringio.com. The "refining" problem (testing stolen credit cards) is much worse for sites that generally receive small, one-off payments. One of the hardest hit groups is non-profit organizations who accept/solicit donations. They regularly get clobbered by charge-backs and other issues.