Suppose Harry decides to go on the scorpion. Which result would be a cost?

 - Harry will have more fun on the scorpion than he would have had on the screaming swing.
 - Harry will spend more ride tickets on the scorpion than he would have spent on the screaming swing.
This result is a cost. It involves giving up or spending something that Harry wants or needs:
Harry will spend more ride tickets on the scorpion than he would have spent on the screaming swing.