Do you have evidence for this or is it just a guess on your part? I'm a bit puzzled why this would be such a dealbreaker for someone -- if a potential attendee saw other things in the publicity that were attractive, not sure why this one thing would throw them off. Doesn't seem like that hard a concept. Do you make the same assumption about less well-known writer guests or media guests too?

Sorry to be so inquisitive but I don't think I've seen any other cons do this so I'm trying to understand the reasoning.