It was somewhat of a similar experience.
Back in 2007, I sold an image hosting site that was making about $50-60/month. I sold it for $400.
Two days later, I search google for my sites name and I see another sales thread for my site. So, I check it out; and the new owner of the site is selling. His starting bid was $400 and Bin was $1000. Some fool actually bought it for $1000. I sold it because I needed the money, but I only made $400. This guy re-sold it, and made more than me.
I do sell some of my sites when I need the money, but then I see the site performing really well. Can't do much about it. If you go back to buy it, you will be paying much more than what you got for it.