I don't even play single players games all that much now. It's been Dota 2 and now Overwatch. To paraphrase, "the highs are high and the lows are low". I just feel like there is some sort of overlap here between gambling and gaming. You'd maybe understand if you solo queued MOBAs. 

Research between gambling and gaming is very similar. 

True. You roll in Kind of way for a good Team or a good game like you roll on a one-armed-Bandit for matches. Could be pretty addicting.