I know the feeling. I am deeply attached to all of mine. I had actually built a "modern" (for me anyway) bike a few years ago, it was a '93 KX250 that I re did from the ground up. I rode it a few times, and then I hit a rough patch and I had to sell it. I got a good price, but it was hard to see it go.
The guy who bought it actually kept in touch for a while, he put 10 hours on it the weekend after he bought it and he was really pleased with the way it ran.
He wound up selling it a year later, and he called me then, but I didnt have the $$$ to buy it back. :bang: