Things like this is the very reason I quit fixing up used equipment for resale with a 30 day warranty. Just keep getting insult offers. One the last guys said he could buy mower all day long at yard sales cheaper than what I had priced at. Ask him did he see the end of the driveway and he replied yes. I hit it and don't come back.

Just because they can used partially broken down equipment on the cheap don't mean I will sale equipment that is good working order for the same prices.

So basically I became a repair only shop.