I also believe the mood and atmosphere plays a large role in the effects of dome beer.
As other have stated, 4 dome beers is equivalent to more than a 6 pack.
Essentially, if you buy 2 beers to start the game, and 2 during the first intermission, and finish them during the second period, you've put back a 6 pack in less than 2 hours. Add on top, the general atmosphere of a good time, and you'll be feeling a lot drunker than you would at home, drinking at a slower pace, alone, or with a few other people.
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