I have just been reading comments about the dangers of buying for concerts in advance. I purchased 2 Tina Turner tickets in September 2008, for the 02 on the 7th March, sadly didnt get the tickets, and due to the time factor didnt have the protection of pay.pal. So be aware, I did get my money back however through the banking system. If you do purchase for concerts out of the 45/60 day paypal period do so using your credit card, as it is protected and you will get your money back.
Hope the info is of help.