The same reasons convenience stores sell single cigarettes, and people smoke them in their cars. Compelling cravings don't care about your externalities and don't want to wait. Lots of people don't want the people they live with to know how much they actually consume. Some people live with others who don't allow beer in the fridge for various reasons. Some have a housemate who can't be trusted around a surplus. Lots of people like to think of themselves as the kind of person who doesn't need to have a whole pack around, they just want this one and maybe another one. Depending on who you're hanging out with, sometimes it's nice to go to a BYO party and not contribute a surplus if that would get abused. And as always, who said they waited to get started until they were driving home anyway?
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