Basic statistics: just because the average in the top decile is 74, that doesn't mean everyone in the top decile drinks 74. The top 5%/1%/0.1% who drink way more than 74/week (15/day? 20/day?) can counter-balance the 5-8/day crowd.
To give another example: the average top decile Facebook employee has a net worth over $33 Million. That seems high, but that's because that net worth is highly skewed - in fact, I assumed only Mark Zuckerberg's wealth was distributed equally among FB's ~10k employees, and that everyone else has $0. The figure $33 Million is meaningless.
That's sound statistics, but consider that that average value figures to over 10 drinks a day every day, and there's probably an upper limit on how much alcohol you can drink, even with an alcoholic's level of tolerance.
Salaries at Facebook are probably exponentially distributed, but if drinks per week were distributed that way, then the top 5%/1%/0.1% would become very dead, very quickly.
To give another example: the average top decile Facebook employee has a net worth over $33 Million. That seems high, but that's because that net worth is highly skewed - in fact, I assumed only Mark Zuckerberg's wealth was distributed equally among FB's ~10k employees, and that everyone else has $0. The figure $33 Million is meaningless.