If you buy tapping equipment, you can keep it for several months on tap without it going bad. With a party pump, you're looking at about a 24 hour window before the beer is oxidized and starts getting infected by the bacteria in the air you pump into it. I've seen where a keg of Guinness cost someone in Canada something ridiculous, like $270.
Guinness is pasteurized, and it comes warm from across the pond, on a container ship, so there's no reason you can't keep it at room temp until you're ready to tap it.
The tapping kit is somewhat expensive, if you're only looking at one keg, but if you think you might get one of these here and there, it might be a worthy investment. Just have your 10 buddies kick in a few bucks whenever they're going to be drinking one of these kegs, and put it towards the tapping equipment. Just make sure you can get the beer gas somewhere in your area before you buy anything.
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Sometimes when I reflect back on all the beer I drink I feel ashamed.
Then I look into the glass and think about the workers in the brewery
and all of their hopes and dreams. If I didn't drink this beer, they might
be out of work and their dreams would be shattered. Then I say to myself,
"It is better that I drink this beer and let their dreams come true than
be selfish and worry about my liver."
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