People that want to drink all night and brag about finishing off a bottle themselves, people that like the taste and don’t need the buzz to get all the way to falling down drunk, people that can’t be bothered to mix a drink and don’t want to do shots of straight liquor, etc. See there’s no accounting for taste - just because you don’t like something doesn’t mean that no one should. No one I’ve ever known is buying Fireball because they want a half decent whiskey or even a shitty flavored whiskey. They buy it because it’s cheap and easy.