ManuelMaiden95
Trooper
Could the band name also be a key factor? Metallica has "Metal" right in the title, whereas "Iron Maiden" does not. Both are bands that are easily accessible and recommending to new metalheads, but Metallica seems to be the first choice for someone looking for them, and I think part of the reason might be because of the name itself.
I agree, the band's name is highly identifiable and comercial.
It is like the first thing that comes to mind because the name resembles the name of the genre.