I am hoping this is not related to the multi-day next event. I have missed many events ranging from past Gencons to Encounters seasons and told that they would not reprint the material -- because they want it to be a unique treat to participants. If I signed up for an event, scheduled and committed ahead for the limited event and found out that it would be sold as a book the same day... I would be annoyed. That is petty jealousy, though. I would have no problem if they reprinted the material (or posted it online) 6-12 months later; as I wish they would do with Encounters.
However, if they sell a book of adventures during the same weekend as the event itself -- that would be a BIG mistake.