How come when people as people "what is your favorite artist?" Everyone always?

Black Sabbath is famous. They're my favorite band because I love the music. I listen to a lot of underground/lesser known bands from many different genres. I could list literally hundreds of bands and artists that most people in this section have never heard of, but I don't, because those bands, no matter how much I love them, will probably never make me feel the way this one famous band makes me feel.