At least on Reverb I save about 12-20% on shipping through them....usually UPS going long distances. I can't get those savings myself. They'd have to go quite a bit higher on their rates to get me to drop them. It's not like I can sell stuff near as fast or for as much on CL....or Fleabay. And shipping through them they give you "Reverb Protection." That sounds better than "PayPal protection."