Though, I noticed a lot of satisfaction from my life comes from interactions with others. Games no longer encourage quality interaction like they used to. Your friends get older then get married and get busy, so theres less of that. I usually analyze a game and decide if its wasting my time or improving my time on this earth.
Then there are the single player games. I feel like these had more meaning when the market wasn't as saturated. A lot of times you're just chasing nostalgia from that one really good game you've played. Hoping to recapture the same feeling. Not only that, most aaa games now days are now products of money instead of passion.
So if I had to guess why anyone stopped it's probably one of the reasons above.