I don't know why anyone would go to York in April or October and not join the TCA on a 6 month trial membership. It's only $20 and you can see all the halls. You can only be a trial member once but since 2 halls is most likely going to cost you $14, why not spend the extra $6 and see all the halls? You might get hooked and become a regular member.
Neither do I. If this information is accurate, then effectively they've opened the entire show to the general public.