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

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