My husband rolls his eyes every time he sees my purse busting at the seams with loyalty cards. Most retailers have become pretty savvy in figuring out how to track customer spend, and in the process, they learn a lot about my (buying) behaviour and entice me to keep spending. The travel industry has this down to a tee as well; creating loyalty through points or rewards schemes for frequent travellers. What do I get out of it? Special offers, free delivery, dedicated customer service....