One thing that's great about gaming as an addiction: it's very inexpensive. This has been changing for the worse with all the pay to win stuff, but there's still a fair amount of cheap gaming out there. With a gaming addiction, never leaving the house and a minimal food budget I wonder how much the average gamer subsists on each month.
I had a friend whose brother would go to work and come home and play video games every day. That was literally it. Work, pay rent, game, eat sleep. I watched him repeat this cycle when we were hanging out. He didn't even have much to say most days.
The hikomori in Japan are already adopting this terminal frugality en masse.