"What sort of buying pattern is associated with binge drinking?"
That is what the question should have been <!-- s:lol: --><img src="{SMILIES_PATH}/icon_lol.gif" alt="

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If you accept that humans have a daily discount rate. And that paper provides evidence they do. Then their consumption is front loaded to enjoyment now.
This might not be major news to anyone who was ever a student and spent for the first week of the month and starved for the last.
Take binge drinking to be 5 standard drinks in a row during the last 30 days[/url:1cscsflx]. Now the difference might not be that much. As anyone nearly drinking a six pack in one night is binge drinking. So* it does not matter if they only bought a six pack and drank 5 of them or whether they polished off a crate they are still binge drinking.
*actually thats stupid of course it matters just maybe not for this measurement.