Not trying to be contrarian, but coming from a family of drunks, I can assure you there's lot of room in the pisshead spectrum for variation & a lot of them certainly do.
Also my last lodger never went out but would sit in his room each night and cane 6 tins of beer or a bottle of red wine. Going out and drinking is just too expensive if you're doing it every day, and not every drunk has to drink until there's no money in his account or nothing left in the house, many drink just enough to get the monkey off their back for the evening.