Wow- To be fair, you can exactly walk into an amusement park and claim that you wont go on any ride and therefore shouldnt have to pay admission fee. If you walk into the park you pay admission. Period. I dont think they have a way of ensuring that you dont go on any ride. Your claim to sit in your car the entire time may be true, but they have no way of knowing that. I am sure they have been burned numerous times by people making the same claim.
That said, after spending $1000 they should have let you in.