whirlwind
Headphoneus Supremus
I agree with you about Grado not going to CanJam because I've never heard them mentioned at all from following the CanJam threads. It would also definitely be strange if Grado didn't go to NYC, so you and @ranfan are probably right about other vendors just using Grados at their booths.
I always found it quite interesting that Grado did/does very little advertising.