The difference is parks will last much longer than a month long event. When the event ends, most of the things will never return in the same format. Will most people spend at least two days anyhow? Probably. I live in Florida and I'm a big horror fan yet I only experienced HHN for one night last year. Not everyone can make it to multiple nights of the event whether it is transportation issues, money or other factors. That is all I was trying to state. Luckily, I'll get to enjoy multiple days of HHN this year so it won't be an issue for me anyhow. In the end, I don't think it will be what makes up Universal's mind anyhow. If they want to do it, it'll happen whether or not everyone can see everything they would like in one night.