Suppose Audrey decides to go on the screaming swing. Which result would be a cost?

 - Audrey will save some ride tickets. She needs fewer tickets to go on the screaming swing than on the log ride.
 - Audrey will give up the chance to go on the log ride. She would have had more fun on that ride.
This result is a cost. It involves giving up or spending something that Audrey wants or needs:
Audrey will give up the chance to go on the log ride. She would have had more fun on that ride.