I've sold more than I've bought on here.
When someone inquires about a part I'm selling, I first direct them to my Ebay feedback page to check my honesty.
Secondly, when I sell something, I represent the item perfectly.
If something is wrong with an item and I didn't state it, you'll get 100% of your money back plus shipping.
If I stated the flaw and you still agreed to the purchase, it's yours.

I value my word a little more than screwing someone out of $50-$100 bucks.