hearthemsing22 said: "I know emergencies happen, things come up last minute that are beyond your control, but do people just not read where it says "all tickets are final sale"? Unless an emergency comes up, you should be ready to go to the show on the day you purchased the ticket for."
I think we all understand that policy, but I also understand (mainly from this board) that the ticket services will sometimes work with you. I've never had to do this, but if something came up I wouldn't hesitate to make a call, ask politely for an exchange, and accept any answer I receive.