I really, really hate posts that say things like "Uni always wants to keep it in one park" and "Potter will never be open for HHN because Rowling won't allow it" (heh). Unless you sit in on the executive meetings where these decisions are made and contracts are signed, stop spouting this crap as fact. It's fine to say "I don't think Uni will ever expand to both parks for HHN again" but the fact is that nobody is precognitive. Anything can happen. Just like everything else, opening IOA for HHN is a money issue. Is it worth it? They may have to keep attractions, stores, restaurants all open and pay all of those people that run everything just like they do during the day. Unless USF is having capacity issues consistently, why would they open the other park and deal with all of the logistics problems? And yes, there is a hard cap for tickets that they legally cannot pass. They usually only hit that number on Saturdays towards the end of the event. Opening Diagon Alley gives them an extra couple thousand tickets that they can sell. In regards to this year, yeah it definitely feels like last weekend was the busiest opening weekend that I can remember. We waited 2 hours for RUN and everything else was at least an hour. I typically never wait in anything over 45 minutes on opening weekends unless it's a big crowd puller like TWD and it's right in the middle of the event (10-11pm). I'm a little worried about the rest of the event, but Wednesdays and Thursdays should stay relatively tame. But again, we'll see I guess.