Suppose Hector decides to go on the balloon race. Which result would be a cost?

 - Hector will give up the chance to go on the roller coaster. He would have had more fun on that ride.
 - Hector will save some ride tickets. He needs fewer tickets to go on the balloon race than on the roller coaster.
This result is a cost. It involves giving up or spending something that Hector wants or needs:
Hector will give up the chance to go on the roller coaster. He would have had more fun on that ride.