Oh and you can compare the charts which is pretty obvious:
http://users.telenet.be/mmodata/Charts/Subs-1.png
http://users.telenet.be/mmodata/Charts/Subs-2.png
1. wasn't instant
2. takes time for discount long-term subs to go inactive
Me, I had the SOE all access thing, I didn't officially unsub until SWG:NGE was released about that time, though didn't go to WoW :P