I'm sitting here in the airport waiting for my flight and I've gotten word that my flight is over-booked. Why do airlines do that? I mean tickets are nonrefundable (by and large). People spend a lot of money to go to a location, so there is a need and intent. Yet the airlines sell more tickets then seats? They then have to give a voucher for a future flight and get you on a new flight - seems like a lose/lose proposition from the airline's perspective and it will only anger those people (I pray its not me) who get bumped.