I suspected that you could call their customer service and get the same price ...and shipped
If you bought it with an Amex..or certain other cards they will double the manufacturer warranty...Visa Signature cards will double as well
You can also typically buy additional coverage cheaply through your CC company as well
I would suspect they replace the panel...based on the condition you described, and then resell it as a refurb
If it wasn't for the fact that the issue is hard to notice depending on how they test the panels, the fact that tons of people have reported replacement tvs having the exact same issue, and the fact that it gets worse and more noticeable over time, I'd say go for it.
The 60" panels don't have that issue reported, but the 70" ones do, and it is quite common.