I just read something about the music industry not doing too well nowadays.
But I can understand Fugazi's sales back the heyday of a healthy industry. Fugazi toured relentlessly, playing fantastic shows, and it paid off.
Not sure how they advertised and promoed a new album. I'd like to hear more about that.
But Fugazi inspired devotion. And it was cool backintheday to order an album directly from the band! In my little neck of the woods, I remember all the cool kids doing so. That special order held a special place in one's CD collection.
Can't say why Fugazi sold more than SY. I'd think most listeners would find both very challenging, but maybe Fugazi is slightly more accessible? I dunno.