As stated before, one only needs to have 5-6 alcoholic drinks per day to break even. I, myself, will usually have 4-5 alcoholic drinks per day while on a cruise. On top of that I will also have a couple of specialty coffees, tea, a couple of waters, perhaps another bottled tea. After that, I am getting more than my money’s worth. As for my drinking habits at home...I never have a drink through the week. I may have 1 drink on the weekend and perhaps a glass or two of wine.
The OP is obviously assuming that people who buy Cheers are drunks. They are not.