Oh gods, Magic. That was also a thing I did. It was mostly okay because I only played Sealed Deck tournaments (I'm very good at being pragmatic with what I've got at the time; I'm not inclined to spend money to get The Perfect Deck).

I can't pretend to know what it's like to have a teenager, but I can guess that it's probably really cool that you have a fundamental understanding for how his brain and internal reward system works. Might not be the most useful thing now, but as an adult he'll almost certainly appreciate it.