I personally think that the rule should be face value + booking fee + postage. I don't see why sites such as SeeTickets, who are essentially authorised touts should be allowed to add on a booking fee, but resellers can't, even when they don't make a profit!
I'm also sure that if you link to ebay with with any profit margin going to the Teenage Cancer Trust, no one would complain about that (in fact you will probabaly have more chance of selling them, and will be helping the cause!)
Thanks for your comments , I did include my booking fee on my first post but to be honest I would rather just take a small loss and have someone go that genuinely wants to see them
Barcroft, I went with face value + fees + the stupid 'cancer trust' surcharge when I sold on ebay. This took the total ticket price to £99! Ridiculous, but still 'face value'. Managed to sell to some fans too, which pleased me...