I think it was several factors, with profitability being the obvious #1. Sure, the locals/AP's enjoyed it, but there was no real draw to bring in the GP. I'm sure package bookings have been soft the past couple of years, too. I also think last year's more negatively reviewed experience didn't help.
They saw an opportunity with RTU to slide in, which they admit works in RTU's favor a lot better with weather and school schedule, all while they retool for a future Potter-themed "weekends" event.