They sell because I put lots of clear pictures (even for cars I'm nearly giving away), and I give a detailed, honest description.
Then, to top it off, I'm not greedy, so I price my stuff fairly.
My stuff disappears pretty quickly.
The last one sold on the first day.
I figure that the less I have to deal with the process of selling it, the more I win, and I have fun creating the ad...
I don't however, have fun showing vehicles.