1. it's cheaper to add days and waist a ticket for a few hours in a park than getting Park hopper most of the time. For example a 6 day ticket is 231 per. For 12 bucks more you can get 4 more tickets and just blow a ticket if you want to "Hop" to another park. it's 283 to get 6 day Park Hopper.
You can't do this. You won't be admitted to a different park on any given day unless you have a Hopper. The ticket won't work in the turnstile.