people do take the piss with postage cost soemtimes but its a way of getting more money, i have sold loads on ebay b4, all my postage is insured regardless, sometime i make a bit, sometime i lose abit, shit happens.
yeah he was taking the piss charging £2.50 and sending it with 28p stamp on, but, the item was as expected, in good condition etc etc, you could email him and ask about it but i wouldn't bother wasteing ya time, leave positive feedback if you happy with item and service, and put something like, item as described, very happy with it, postage cost abit high tho.

gets the message across in a nice way without slagging anyone off, this was you should still get positve feedback too.

its when you see a set of rear clusters with £10 P+P and £2 extra for insurance, thats ripping you off, i just sent a carb and inlet manifold, 2-3 day, insurced for £50, guy offered £10 P+P, it cost me £8.96 just to post, box came from shop, bubble wrap was from when i got sent a bumper and i live 4 min walk from postoffice, oh and tape i borrowed ( ) from work, parcled it up and sent it for £1.04, sound ok to me.