They don't want to be caught with not one extra crewmember on reserve in the fall! There is alot they can do with that one extra FO's salary. They can...
1. Have a very small office party
2. Fix the copy machine
3. Replenish the petty cash box
4. Buy an extra lot of paper for memos
5. Pay the phone bill
6. Give the CEO a small bonus
7. Hire a maid to clean the CEO's office
8. Get a happy ending massage
...any other ideas?