Also referred to as “spillage” in the industry, TowerGroup found that through 2008, expired cards had the highest channel for lost consumer value, accounting for 52 percent of spillage, followed by fees. Fees, such as a $1 service charge for inquiring about your balance, caused an estimated 39 percent in spillage. Misplaced cards contributed 9 percent of total lost value.
Source: abcnews.go.com