I, for example, might order a beer at a restaurant, with my food, just because beer tastes good to me (This is not the case for me personally, but for some, it is). However, you would rarely see someone order beer after beer with their steak - like you usually wouldn't see someone buy a lot of coca-colas - since drinking anything in a large amount usually has nothing to do with the drink itself - but rather the effects the drink will give you.
The reason many people have trouble understanding this is because the word "binge" often has connotations of beerkegs, teenagers going wild, crazy parties, etc.
To tell you the truth, rarely, outside of anti-alcoholic literature is this term used in its true meaning. Most of time people just use it to mean getting f-ed up.
