On all of my flights this week, the airline had overbooked and asked for volunteers. Last night, a family of 4 was waiting to board. Three people volunteered to take the $600 voucher, meal, and room deal and fly out this morning. The flight attendant then came down the aisle saying that he wasn't sure how it would work, but that someone had to volunteer or they would have to choose someone to get off. How would they choose? Is it a last ticket purchased, first person off thing? Why do they continue to overbook? It would cost them less money to always keep two to four seat unfilled than to continually give out vouchers.