That never crossed my mind as I've never needed to put mine up on the exchange! I do still think that some fans simply can't be bothered putting their seats on the exchange and it baffles me because it's a no-lose situation - it doesn't cost anything to do it, and if it sells then it's money off next year's season ticket.
What's the latest that you can put tickets on the ticket exchange and realistically expect them to sell? I missed the Swansea game after spending the night pebble dashing the toilet bowl. Would I have been able to use the ticket exchange on the morning of the game? Most of the relatively few games I've missed have been due to sickness on the day or a last minute domestic crisis. I have used the ticket exchange 3 or 4 times when I've known in advance that I wouldnt be able attend but I'm reluctant to do that after a mate called off his wedding after I'd already sold my ticket!