From their site:
For many consumers, the pricing issues surrounding supermarket "loyalty" card programs can be summed up in one simple concept: those without a card pay more at the register. The stores portray it the same way, but call it "rewarding loyal customers" with lower prices. Though this sounds simple, few things in life are as simple as they seem and supermarket cards are no different.
Pricing issues with card schemes actually fall into two categories: savings and segmentation. While the savings issue has the greatest impact on consumers today, it is segmentation that will have implications for years to come.
The recent proliferation of card programs throughout the country makes it clear that participating stores think they are a wonderful marketing tool. But when consumers take off the rose-colored glasses that the supermarket hands out along with their cards, they find that the programs do little good for anyone but the stores themselves.
This is also the organization responsible for the book, spychips.