Why should I renew my subscription? N360

Just a quick question. My subscription is almost up and was wondering why should I renew? I had a chance to play around with MSE on my other PC and have to tell you it worked just fine. Windows 7 does a backup and system image. Outlook catches spam better than Norton–like just now Walmart goes to Norton spam folder while some guy tries to get me to put my login and password for my bank site goes to outlook spam folder. I see alot of people having problems with malware and spam type stuff on this site and are told to download a free software program to fix it. Mcafee has a free site advisor program that does just as good if not better than Norton. The only thing that I really like is the fact that Norton keeps my login and passwords for me but I’m sure if I look hard enough there is a free program for that. I don’t know anything about N360 4.0, maybe it will come with or fix these things, I don’t know. But can someone please tell me why should I renew and spend about $70 when most can be done for free??