I used to play a lot of video games, and while not all of the time I would consider 'wasted' I definitely could have used some of the time doing something else that would have made my life better today.
There is an opportunity cost to everything you do. Time is the only truly limited resource in life, you should try to use it as wisely as possible. Everyone needs some leisure time, but it shouldn't be the majority of how you spend your life.
Chances are, in an alternate reality, you'd just be stressing about a different set of things.
I was mostly referring to things that you put lots of time into, but don't get much long-term value in return. For example gaming grants you short-term fun, but (for the most part) doesn't give much for long-term. Money/reputation/progression doesn't mean much outside of the game/s you play. In some cases you could "sell" your account, but the amount you get would probably be less than .25 cents/hour that you put in.