Are less p&p fair?

[RoseRedder]

Relatively new to ebay so this may indeed be the norm

P&P charged £4.95 v's actual cost £3.70

P&P charged £3.70 v's actual cost £2.60

Do sellers add a poundish on as standard for wrapping and taking to post office?

It doesn't matter. Honestly. Imagine that dress being available from one seller for £10 plus £7.99 p&p and an identical one being available from another seller for £20 plus £2.60 p&p. Which would you buy from?

These days I often sell stuff with free p&p. How should that work? Imagine if I contacted the buyer once the transaction has been completed and said "now you also have to pay me £15* for the p&p because that's what it actually cost me". In that case the buyer would laugh and tell me they'll stick with what was agreed at the time of sale.

• Buyers will often pay noticeably more than what the normal cost should be and what the p&p would be.

** A real world example.