I don't think you will ever get a sale here honestly. Those PSUs arent for mining. The Corsair and Thermaltake don't even have enough PCIe connectors.
The generic Dell looking one can never be used for mining.
I had similar PSUs as these in my GPU mining days. I just sold them on Craigslist for like $20-30.
You're right, to be honest, also in term of efficiency, but people come here to buy or sell computer components too, so maybe someone on a tight budget to build a PC would grab one. In that case it would not be a bad idea at all.