Hmmm. Used Comodo firewall (free) since they began supplying free security products. Tried AVG AV years ago and didn't like it and went to Avast! home edition that's been upgraded to the modern times and is still being updated and keeps me out of trouble. No doubt that common sense while surfing adds a whole new dimension of not getting viruses or malware but that's by the by and true of paying for security suits or not.
So personally, as a user of a home PC, I think you've been wasting a lot of money over the years.
Entirely up to you, as only you know your surfing habits.
Remember, though, that no amount of paid for or non paid for security will keep you safe if you inadvertently or knowingly allow malware on your PC through clever marketing.