+1 - Overbooking is not consumer unfriendly, it keeps fares down. For those who think it's consumer unfriendly, ask yourself whether you would pay a substantial (and I really mean substantial) premium in order to guarantee a seat. If carriers offered 10% of their seats with a 25% premium above Y in order to guarantee a seat, would you pay that?
The reality is that IDB is infintesimal and even those, when they occur, are often due to systems failures rather than strategic decisions by carriers.
As B6 moves from an LCC leisure carrier to a more mainstream business carrier, it too will need to plan for more flexibility. And, flexibility means last minutes changes with attendant no shows and thus seats to fill.