Why would someone buy a £5 gift voucher for amazon for £4.73 with 25p postage? Is it really worth the effort. There are countless auctions of people bidding nearly up to the value of the voucher.

Or is again some sort of Money Laundering scheme that I am unaware of.

Like the 'leftover holiday money' I found this very odd. People would pay more than the going rate at the currency exchange There were people buying 50 euros for 50 quid. (pre brexit)