It could be that he hadn't quite reached that stage of his alcoholism (drinking during the week), but more likely in my eyes is that it created a sense of anticipation for him. Sometimes alcoholics can play it cool during the week because they can go wide open once the weekend rolls around. Gives them something to really look forward to. (I was like this for a certain stage of my drinking). Plus it probably has the added benefit (in his eyes) of giving the illusion of control. ie; see? I'm not an alcoholic. I don't drink during the week.