Why I dont buy the individual volumes

So im 17 years old, but I never started reading the comics until december 2016 which is when I received the 3 compendiums for christmas, I was a little young at the time to be reading the comics in general cuz I was only 14. So thats the first reason. the second reason is the price. I believe each volume of the walking dead comic series was about $20 which was to much at the time, and i was unable to afford them. And I had already had the 3 compendiums at the time. However I may eventually buy the all the volumes or issues because it would be a cool thing to add to my walking dead collection of items.