"So you can't have a comic convention without Marvel right?"
Well, except for that time when you had no plans to go to San Diego Comicon, but because of fan presence, you managed to get a few chairs set up in a corner somewhere.
And your decreased presence, down to very much the same presence, or sharing Wizard's booth in Chicago a few years in a row.
So, I guess you CAN. In fact, you guys support not being at conventions...