No, 90 days is the standard for snakes, but it should be 12 months, since some viral diseases can incubate for over 10 months.
No QT required for reptile expos...it's a risky venue. I handle snakes that have been to an expo more cautiously, and avoid transferring equipment or or food.
I'm not sure why we wouldn't judge reptiles on body conformation as well as color and pattern. If we fail to pay attention to that over time, we may wind up with some animals that don't look quite 'right'. The Crested Gecko people are already paying attention to crest structure.
People can pooh pooh this idea a lot, but I think it may be inevitable in the long run...for better or for worse. If people start doing it, well...who wouldn't take the chance to sell an animal they were planning to sell anyhow for top dollar, because it won a ribbon?