Your logic and insight are much appreciated, but unfortunately this might not be as anomalous an issue as you think. Dell users are experiencing the same issues, and Dell has responded in kind. See: http://direct2dell.c...6/19/17774.aspx
It seems the affected LCD screens may in fact all come from the same manufacturer in Shanghai, although no one seems to have proven that theory yet. But if you understand manufacturing, then you know that many OEM's source their parts from the same factories, hence the big recall with Sony and Apple batteries a few years back. In that case, the issue was more pressing: safety. In this case, you are correct, Apple is well within their rights not to pay for repairs outside of their warranty. However, Apple has built their business on good will and good design. So when a design flaw is discovered, they would do well to back up their image with a substance, lest they risk their user's loyalty.
Lastly, I wonder how many users have been plugging in the non-grounded travel charger attachment rather than the three-pronged grounded attachment on their power supplies? I read somewhere that vibrations in the screen can cause this issue, and using an ungrounded plug causes my machine to vibrate ever so slightly with electrical current. Just a thought.