Men evolved to hunt large dangerous game and fight the other tribe. Most of what we do nowadays for a living is rather boring and not satisfying on a primal level. One can derive a measure of the primal thrill of chase, kill, conquest from a game like AH, especially because it is simultaneously so intense, complex, random, and strategic. AH is available 24/7/365 and in all weathers, and thus is more convenient than hunting animals. (Although I always enjoyed the hunt and certainly the eating of delectable flesh, I have always been conflicted, taking no pleasure from the death of a dumb beast who never did me harm. The virtual "death" of a victim in AH though....

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AH is also more convenient and sensible than picking fights in bars to get your primal jollies. One might also say in this way gaming is comparable to porn/masturbation. Not a knock, I'm not about to condemn behavior virtually every male primate engages in.
After all, in the modern world we can't all be big-game hunters, professional pugilists, fighter pilots, or SpecOps.