Surely there can't be that many Rush fans left in the world, and how many of them are going to be in the market for a jacket that shouts "I'M A RUSH FAN!!" 24 hours a day?
According to the stats ... 341,000 attended the 2012 world tour ( 35 locations ) .... add to the list those who detail them as their major influences inc. Dave Grohl etc. etc.
I guesss the same way associative marketing works for a Ramones / Stones / AC/DC / Beatles / U2 ... T-shirt
or sweatshirt.
I guess they feel the same way about Rush as you feel about Aero Sloanie ... different strokes for different folks