Am I Being Unreasonable? Original Owner Wants Car Back

I'd like to buy back a few cars I sold 10 years ago for what I paid too.

ps In 2022 I had two guys that sold me things want to buy them back. One was a car but he got cold feet. It was his fathers car. The other was a bass guitar that suddenly had sentimental value a few weeks after he sold it. I asked for $200 more because I had put new strings on it and modded it which now had to be undone. He didn't think that was fair and bugged me for months about it.