I'd like to show another point of view on this:
I think a park has a heavier interest in dispatching faster and getting more people out of the queues. While a guest is standing in line, they aren't spening money. I think any park has the interest of getting people on and off as fast as possible so they can buy an on ride photo, food, or play more midway games.
Sure a fast track system brings in money, but it's a one time flat price that very limited amounts of people will buy. Then factor in the complaints and irritated guests in a queue, I think it's a wash on the money side.