The question I ask myself is if the part-time dealer who bought yours sold it at a large markup percentage, or listed it at a large markup percentage that allowed him to negotiate down to a modest profit?
He asked nearly 3x what he paid, and sold it for more than double. OTOH, I am far enough out of town to give pause to many buyers, and work too much to call my availability good. It was more likely to be stolen from me than sold at the price he got. I have no doubt that he failed to disclose the overheating problems that I disclosed to him, though.
I was happy to sell it for $1500. He listed it for $4200, and I'd bet got more than $3000. He's the only prospective buyer I had actually drive up to see it. It might go another 30 years down there on the valley floor pulling a 4' rotary cutter, but it might only last 30 minutes until it boils over. Regardless, I sold it with full disclosure for a price that was agreeable to me, and ended my association with the tractor at that point.
When my wife and I got married, she had a '76 Olds Cutlass that had been beaten to death. Had almost 200k miles on it. It needed a quart of oil with every tank of gas - not burning, LEAKING. The front end was worn out, so it ate tires. But they were very popular cars. I put it in the newspaper (before Craigslist) for $1500, got lots of calls, only one grizzly older guy came to see it after getting full disclosure. He arrived in a '64 Chevy stepside, complete with mismatched body panels, rusted doorsills, and a horse blanket on the otherwise bare seat. He didn't care about the issues, 'cuz he was a "mechanic". Offered me $700 cash and the pickup. I knew I could sell a running pickup in Bakersfield for at least $500, and I doubted I'd get $1200 any other way, so we swapped pink slips and away he went. The wife came home and wanted to know when the owner of the world's ugliest pickup would be back for his truck. She was less than pleased to find she was talking to him (me). Calmed down when I told her I was selling it.
The next morning, I told her I'd probably need a ride home from work as I'd be taking my "new" truck. She asked why I was taking it if I didn't think it would get me home, and I told her I expected to have it sold that day. She was skeptical, but off I went. I was opening manager of the Circuit City store at the time, so as I let employees in the door I pointed out the truck and told them I'd sell it for $600 if the knew anyone who needed a work truck. The janitor called his brother, and two carloads of family came to see it. The brother (a very large young man of color) offered me $500, and I declined. The family huddled up in the parking lot, and he came back with $580. I accepted, then handed him back $20 to fill the gas tank. Called the wife for a ride home. The following morning, the mechanic called and wanted to return the car and get his money and truck back. Seems the Cutlass leaked oil, as advertised. Told him no, as I had not misrepresented the car in any way. He agreed that he'd inspected the car, that I'd disclosed the leaks, that he'd seen the oil all over the bottom of the car before he'd bought it - but his wife was unhappy with it. I told him MY wife was unhappy with the truck, so I'd sold it. End of discussion.
About three weeks later, my view was filled with that same huge young man of color - he was looking for ME. He flashed a million dollar smile, stuck out his hand, and thanked me again for selling him that truck. Seems he'd never been able to keep a job, because he'd never had reliable transportation before. That ugly old Chevy was doing great for him, and he was grateful that I'd sold it to him. It was getting him to work every day.