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for me the problem is that that one 5k run is could easily be 50k, and your £20 off the retail price is suddenly not such a great deal, given you were complaining upthread about a pair of shoes with not many miles on having worn through is evidence you've been sold a bit of a porky pie in the past...
fair point about poor conditions of manufacturing and not wanting to create waste though.
Why not? I buy pretty much everything secondhand and have never had trouble. The mad thing is that loads of people seem to sell shoes after a single 5k run. There's a Facebook group called running gear for sale and it's full of pairs around the £40 mark that have been used once or twice.
Coupled with the atrocious conditions for people making shoes and the ridiculous amount of pairs for sale in barely used condition I see it as a positive thing to do!