Standard postage rates for the UK are pretty well known and its fair enough to include another 20-30p to cover the mailer and packing as well as the tape, labels etc sellers have to buy .
Anyone adding too much is really taking the piss .
I sell a lot of records on Discog's and you gotta take the rough with the smooth , you get some good sales and some with little or no profit margin , I've lost count of orders I've had to Europe or the US for a 50p or £1 record once Paypal takes its cut I just break even .
I had a joker from Germany the other day asking for front and back photo's of both sides of the vinyl and same again for the record sleeve ...... I checked the record and I had it for sale for 50p !!!!!!
When I post to Canada and the USA I always end up loosing money on postage .
I had an order today - 3 LPs to Canada and I estimated the postage and packaging at £12 it came it at the Post Office at £14.65 as I'd packed it well so I had to take the £2.45 hit , no way am I gonna go back to the buyer to tell him I underestimated the postal cost that would be bad form .
At the end of the day the dealer should be well aware about the postage costs , in the UK anyway and be fair in setting them .
I'm gonna have to review my costs elsewhere