A few months ago, American Express provided five free song downloads as incentive for its cardholders to make Amex the default card option within the iTunes store (previous post).

Today, I noticed Discover offering an eye-opening incentive to get their card listed as the default option for one-click purchases on Amazon.com:

A chance to win $1 million every time you pay

This offer is part of the year-long Discover Everyday Giveaway usage sweeps. 

———————————

Discover Card’s $1 million promotion on Amazon.com (12 Aug. 2011)
Note: A small ad first appeared in the upper-right part of the screen, this is what it looked like after I chose “Expand”

How it works (link)
Note: This screen presented when clicking on “Learn more” from above banner