I feel a bit uncomfortable!
My son has b*ggered off to Korea for a year and left his rather rusty K Reg car on our drive. So I put it on ebay warts and all expecting around £75 if I was lucky. It went for £240. It was for the buyer's ex-wife and I drove it around to her house so we could complete the docs. It drove ok but the engine was a bit lumpy when we got there and I noticed a couple of other minor problems.
I'm just worried that they won't be happy with their purchase. If they come back to me, I'll offer to refund some of their money. I guess I could just say caveat emptor but they were really nice people. It had 4 months MOT and 2 months tax, so perhaps it was reasonable value.
I feel a bit uncomfortable!, dont be.
You put the car on Ebay, some one bid on it, they paid and collected, job done, no need for a refund either partial or full.
You cant be responsible for other peoples stupidity when it comes to buying cars on Ebay.
I do admire the goodwill behind the thinking though :)