There's no margin in selling TVs. It's been a cold, hard truth to those of us in the consumer electronics business for nearly five years now. Sometimes Walmart will be selling a TV cheaper than the distributor sells it to the independent retailer. It's totally illogical and it gets worse.
These TV manufacturers are not making any money. That's why they tried to push 3D TV on us. They thought it would be another revenue stream. The big box retailers, especially Walmart, dictate pricing from manufacturers and it's not just in the TV industry. This leaves the manufacturer with razor thin margins between the cost of manufacturing a TV and the price they are forced to sell it to the retailer.
We saw it begin to happen late decade when the flat panel TV started to go mass production. The demand was high and TVs were hard to come by. Yet the prices continued to drop steadily. It totally went against economics 101. It got so bad that some manufacturers set up secret price fixing deals. And they got caught, having to pay fines to the government.
So I don't really care where a customer buys their TV, as long as they make an informed decision. I'll often help them make that decision as part of the project, but sometimes I don't get involved until the TV has been purchased.
Here's a nice primer from CNET on TV technology that a consumer should know before shopping for a new one. HDTV Buying Guide [update].