With respect, you're not a theme park economist. Me neither, but I have managed huge businesses with $bn in sunk costs and little OPEX for additional customers (e.g. mobile networks).you will have less people going at the perfect price the point is although that there is a perfect point,
What most theme parks currently lack (in the UK) is data. Disney are awash with it, and it is data that dictates (I think a quote from Lord Kelvin is appropriate here). Do people want a cheap day out, or do they want a great experience?? The world has moved on