Having sat in data presentations from credit card companies, the extent of the data that credit card companies have is incredibly detailed. For those customers who they don't make money on from interest and fees alone, I would imagine that data more than covers the difference. These customer are still VERY desirable from a data perspective.
While there are legitimate tracking concerns, the data the credit card companies capture and disseminate is incredibly fascinating. You've got spending data, layered with market segments, layered with location data (both on the cardholder and the business side), and even time of day. Overlay all that with very accessible data from the Census or ESRI, and they can really tell a significant story of how money flows through the modern economy. This is what's feeding the internal fraud detection engines (which have gotten a lot better), but there are also private institutions that are more than willing to pay the credit cards a hefty sum to get access to all this data.
While there are legitimate tracking concerns, the data the credit card companies capture and disseminate is incredibly fascinating. You've got spending data, layered with market segments, layered with location data (both on the cardholder and the business side), and even time of day. Overlay all that with very accessible data from the Census or ESRI, and they can really tell a significant story of how money flows through the modern economy. This is what's feeding the internal fraud detection engines (which have gotten a lot better), but there are also private institutions that are more than willing to pay the credit cards a hefty sum to get access to all this data.