Comment by tavavex

The difference between them, as pointed out elsewhere in the comment thread, is authenticity. A basic, unassuming poster made by an amateur conveys a simple, grassroots event with no frills. A professional poster made a by a graphic designer signals effort and attention to detail. The average AI-generated poster says that the organizers don't have time or money, but really want to seem like they do. It's like how people tend to perceive someone who wears or owns an obvious knockoff of an expensive status item - it's seen as worse than having the real deal and worse than having nothing at all, because that person is trying to create an appearance of something that's not true.