Haha... my park admission that day is already paid for, so I'm losing out on that value, but you make a fair point all the same.
Fine print sounds similar to the Not-So-Scary Halloween Party at WDW (or similar events) in that you get into the park an hour before the party, and stay after the park closes. So entry at what 6pm? (Maybe 5pm if allowed an hour before check in?)
Makes me wonder where the party ends and regular admission begins. Doubt they'll close off a big chunk of Hollywood land to party guests, then regular guests could complain. Also can't see them giving regular guests access to the ride, then party guests would complain (What are we paying for at that point, if not to ride it before it opens with less crowd? $150 gift bag?)
How did the last ride party for ToT work? (Wasn't there. No idea.)