Larrok, you are not entirely right, and I'll explain why. It's obvious and evident that in all musical genres, there are extremely famous groups that sell, be it jazz, metal, classical, blues, etc. In metal, there are musicians and bands that are almost unknown to the masses, who sell very little despite being very valid and having made history in certain sub-genres of metal. Want examples? Good: Shape of Despair, Therion, Draconian, Lux Occulta, Deathspell Omega, Virgin Black, Elegeion, Aesma Daeva, Evoken, Samael, Eluveitie, The 3rd and The Mortal, Lengsel, Anorexia Nervosa, Tristitia, Imperia, Vision of Atlantis, Haggard, Nucleos Torn, Mors Syphilitica, Xytras, Estatic Fear, OperaIX, Esoteric, Zeraphine, En Declin, Isis, Lacrimas Profundere, Morgana Lefay, Viikate, Charon, Entwine, Lumsk, The Black League, Solefald, Enslaved, Fleurety... Should I continue?
SO DEAR LARROK, NO OFFENSE, LET'S NOT SAY NONSENSE. THESE BANDS ARE ALMOST UNKNOWN DESPITE BEING IMMENSE AND ARTISTICALLY ELEVATED... THEY SELL LITTLE AND REMAIN IN THE SHADOWS OF ART. SO, MY DEAR LARROK, BEFORE THROWING OUT SENTENCES, CULTIVATE YOUR KNOWLEDGE OF METAL, OR RATHER TRUE METAL (NO OFFENSE, I JUST WANT YOU TO UNDERSTAND).