ticketless tickets
I personally saw Radiohead just in april in seattle and the ticketless ticketing method worked perfectly, 20000+ no hassle. My brother and i just took my dads credit card for the evening and entered, it was just like having a ticket. This is something coldplay should start doing. Radiohead sold out all of their shows in 20min or less, the seattle one sold out in the matter of a few minutes. coldplay shows could still sell out just as quickly, but instead of those tickets going to scalpers and cheap sakes trying to get money, they'd go to true fans, just as it should be!:)