So, you buy an already expensive laptop and then have to buy apple care which isn't cheap. Then, you are supposed to "hope" apple takes care of it when something breaks?
That's just not very comforting to a prospective buyer like me. I expect a LOT from a high priced laptop. I don't mind paying more for good products but this attitude of just accepting that it's OK for a high end product to show IR or burn in which is even worse doesn't fly with me. A little IR is probably normal but it should be temporary.
I dunno, it just doesn't seem like IR or burn in should even be a valid topic when discussing screens in 2013. It's an old CRT and early gen plasma problem. Really doesn't make sense to me nowadays. Oh well.
I've worked in and around retail long enough to tell you that if you are kind, courteous, and have a genuine problem, retailers will go all the way for you to make sure you will get the best care and attention. So if you already have this sort of natural demeanor about you, then it's not a matter of "hoping" that they will fix your issues, but rather "how fast" they can turn things around.
Every new product will have its growing pains, regardless of how much money it may cost you. Your life choices are to either jump on the bleeding edge band wagon and ride out the rough times, or you can sit back and wait for all of the bugs to be worked out and buy tried and true platforms (aka. older stuff).
So to simplify your quandary, now that you know what the risks are, if you are unwilling to take take part in it, then it's time to find something else other than the rMBP. You are indeed spending a lot of money, and you should be fully comfortable with your purchases. Remember, you don't have to buy a rMBP; there are plenty of choices outside of Apple, and even a few more within.
By the way, at my work place, I routinely see Planar monitors (who make some of the best touch screens for retailers) in our lab with a solid vertical strip, which takes up 25% of space on the screen, that will have IR. This is true IR, where that same strip is always present, and always one screen behind. The issue may be an old one, and you don't usually hear about it often, but it still exists even in 2013 - and with the way Apple wants to really mass produce these high PPI screens, it very well may persist beyond into future generations of products.