It’s easier to run into someone from NSYNC than it is to run into Justin Timberlake.
More people have stories of running into someone from The Killers than they do to Brandon Flowers.
And security can keep track of a solo artist. But in a band there’s at least someone who doesn’t want to be kept track of…and that person gets run into more.
Another interesting thing is that there’s a usually a hierarchy of who you run into. The lead singer is almost always the ultimate…but some people like the more understated drummer, or the more available bass player. But they each count as an impression on behalf of the band.
And one more…when you run into all the band members at once, you feel the weight of the soul of the band. A truly unique experience.
A band has more interactions. Therefore more people walking around with stories. A wider net of influence. More excitement.