Years ago when I was in college, I worked for the old Pacific Stereo chain. They had a weekend promotional that advertised their house branded Quadraflex speakers for $10 a pair. It was the "bait" item to lure customers into the store in hopes they would buy other items. It was sure to generate a lot of traffic.

When I arrived at the store prior to the sale, my managers were taking each one of the $10 speakers out of the box, hooking up speaker wire, and plugging them directly into the AC outlet on the wall at which point they would promptly burn out. They would then put the speakers back into the box and designate them as DOA and place them back on the truck!

When I asked what they were doing, they told me the $10 speakers were going to cause more trouble then they were worth. Rather than deal with a flurry of angry customers trying to return sub-quality speakers and disappointed expectations, they felt it was better to just tell them the shipment was bad and they didn't have any in inventory!