Wait times and attendance should correlate.
Ah, you just missed my post showing the correlation is not linear. When you increase overall park attendance, you're not taking all those extra people and putting them on the ride and in line. They all go in the line if you're already past the tipping point. The lines increase exponentially at that point.
And if you're no where near the tipping point, then the extra people have no effect on the lines.
It's not a linear correlation.