There is a band called The Rolling Stones that sell out stadiums and charge a war pension to do so.
Meanwhile, KOL plays gigs like The Civic and probably couldn't sell it out for 30$ a ticket without a strong opening act.
I love Pearl Jam and will be a little biased in my assessments , your love of KOL is making you say crazy things like biggest band in the world.
Of course. If Led Zeppelin got together for a tour, people would be selling houses for tickets.