The majority have bought already will go.They have just pissed off people who have got tickets and created a lot more admin than they needed to. Once they announced a date they would then give holders a couple of days to say don't want them. They then put any returns or spares out for sale.
Understand it for clubs up north but this is London .... we sold out all the London clubs last year as far as I am aware plus Southampton , Bournemouth and Watford this year.