Say you have a $200 ticket to the concert tonight in one pocket and a $200 phone card in another. You just discovered that the $200 phone card was stolen. You say to yourself, "Darn, I'll have to buy another phone card tomorrow." But proceed to the concert. OTOH, if it was the ticket that was stolen, you would cancel the plan for the concert and do something else for the night instead. Even though you could buy another ticket (cancel the phone card if you don't have the money), you probably wouldn't do it. It the same $200. Why the different reation?