MY U2 obsessed friend wants to hold on to the tickets we bought for Denver even though I was all for refunding them, since it's a year away and who knows??? I understand from some other people that refunded their tickets that it was a pain, they were really pushy about people keeping the tickets, they di get the refund but it seems it was given reluctantly.
With that said U2 is a really good live band, the fanbase hasn't disappeared so my guess is it will still sell well.