I sell but not on a continuous basis. Some items do better than others. I've never lost money on any of my auctions. I've sold Longaberger items, girl's clothing, antique bowls, halloween costumes, and books. A girl's coat that I originally paid 22 bucks for...sold for 38, the halloween costume cost 15 bucks originally....sold for 36. Bought a smoking jacket at the thift store for 3 bucks, sold that for $40. All brought far more than I could've gotten in a yard sale.
I love buying on eBay. Buy quite a few Christmas gifts there. If I'm looking for something....eBay's the first place I look