What on earth do the Cartel items, the GTN and credit sellers have to do with each other?
So much reaching. People will still illegally buy credits, "Cartel Market items on the GTN" or not.
It could literally be anything: http://massively.joystiq.com/2012/12/14/winter-holidays-around-the-virtual-world/
Okay, maybe not anything. LIke this Cartel-Lifeday "event" isn't particularly interactive, social or fun.