Suppose Darell decides to join the Theater Club. Which result would be a cost?

 - Darell will have more fun in the Theater Club than he would have had in the Photography Club.
 - Darell will spend more time in the Theater Club than he would have spent in the Photography Club.
This result is a cost. It involves giving up or spending something that Darell wants or needs:
Darell will spend more time in the Theater Club than he would have spent in the Photography Club.