The Tourney champ is the official ACC Champion. The winner is extended the ACC's automatic bye into the NCAA tournament.
We have many banners celebrating these championships. They look very impressive in the rafters if you haven't seen them. As a set, all the Duke banners (including four extra special ones) help make Cameron Indoor Stadium one of the coolest places on Earth.
They matter very much. They cause chill bumps on the skin of Blue Devil Fans. Heck, I bet they have caused chill bumps on many non-Duke fans who visit.
You shouldn't have to ask.
Man, if your Mom made you wear that color when you were a baby, and you're still wearing it, it's time to grow up!