Suppose Dominic decides to join the Photography Club. Which result would be a cost?

 - Dominic will give up the chance to be in the Theater Club. He would have had more fun in the Theater Club than in the Photography Club.
 - Dominic will save some time. He would have spent more time in the Theater Club than in the Photography Club.
This result is a cost. It involves giving up or spending something that Dominic wants or needs:
Dominic will give up the chance to be in the Theater Club. He would have had more fun in the Theater Club than in the Photography Club.