Why does iTune needs a credit card to upgrade apps??

[cellulartalk]

I got three notifications of upgrade apps on iTune app. But when I clicked on upgrade, it went to a page required me to enter my security number. Don't know how much they want but since when they required to pay for upgrade apps that I already had?

More... (http://www.howardforums.com/showthread.php/1880451-Why-does-iTune-needs-a-credit-card-to-upgrade-apps?goto=newpost)

Courtesy of WestNet Wireless
www.westnet.ca