Go ahead and buy something large from them, say, a 4-5 burner grill. Big, bulky, costs 1500 bux. You can't get it to light when you get it home. The problem for it could be simple, such as you didn't turn on the propane tank, the hose was clogged with a spider web or other debris. Maybe the gas hose was kinked or twisted.
So you return it to the store and demand an exchange because you claim the original unit is defective. You get the new unit home and it's all fine. Ever wonder what happens to the old brand-new grill? You know what a compactor is? The grill gets tossed right into that ol' compactor, along with every other piece of trash that the stores throw out every day. A perfectly fine brand new grill gets tossed into the trash.
How and why? The manufacturer gives the store the full credit for the grill, but the manufacturer does not allow the store to resell the grill due to liability issues. So the store must toss the perfectly functional brand-new grill into the trash. After all, the store is also on the hook for the grill, because if they repaired it and tried to resell it after the manufacturer gave them full purchase-price credit, the store would be charged with double-dipping. It happens with practically every item they sell. 99.96% of all items returned to the store for an exchange are tossed into the trash, whether they work or not, due to the manufacturer store-reimbursement system. And stores go along with it just fine and dandy, because it is less labor cost for them in having to pay an employee to troubleshoot the issues on returned merchandise. You have NO IDEA the scale of this problem. I cannot BEGIN to tell you what I have seen go into that compactor.
Look at it this way...Every try to shove a bathtub into one? Yes, a fucking BATHTUB. How is a bathtub defective? It's NOT! But a customer returns it? It is hot potato.