No offense to Rush -- I like some of their music -- but I think bands like Pink Floyd would do better commercially. I suppose you have to look at what would be popular in bars?
I'm actually a bit surprised by the success of the Metallica pin. I listened to them in the 80s and 90s (And Justice for All, Ride the Lightning, Puppets and perhaps the Black Album) but haven't really kept up with them.
I think the superhero stuff is big from Stern for the movie theater market. I suppose Metallica is for bars and home use?