Hi Jenson and welcome to the forum,
Probably depends why the product is being returned, for example not a lot of point reselling a defective item because it's juts going to keep bouncing back and costing you feedback and money. What you really need to try and do is not just have an open door returns policy in place, something like a no questions asked. You don't want people returning things just because they can.
So the first thing is to define your policy to perhaps only accepting faulty items, then the rest should take car of itself.