And in that dealer’s opinion: “If I sell him what he needs, I’ll see him again in my store; If I sell him something he doesn’t need, I’ll never see him again.”
If you want to really reduce returns, don’t expect someone else to do it for you. Train your sales staff to not only understand the products they are selling, but to also understand how to qualify customers. Sometimes, that means letting customers know about the cons in addition to the pros of a product. An honest salesman can get a lot more mileage.