Why Do They Still Buy Nortons

From the (l)users department:

So I have for the umpteenth time been dealing with a failed Nortons Antivirus 2005 installation. 

Why is this company ( Symantec) still able to sell this defective product to so many unknowing and unwise users? 

Answer: There is the great American marketing machine in all its glory.

Latest Results screen from Nortons: 
Infected items :22
Items Deleted:0
Items Cleaned 0

What exactly are people paying for when they purchase a subscription for Nortons?