18 pages still going strong, huh? If we're actually talking about "metal" bands and not AC/DC or Guns N Roses (both of whom still probably wouldn't win...), there is one answer: Metallica can sell out football stadiums and giant arenas with no opening band, and force their fans to endure Jim Breuer yelling "YEAH" into a microphone for an hour. Metallica are the only band (not just metal) that have performed on all 7 continents (and they did that all in the same year). Metallica can play The Grammys, perform with Lady Gaga, have terrible sound issues, and still be viewed favorably by fans. Metallica can release an album in any year and it will be the top-selling metal album that year.