I wasn't aware there was a "pixel rule" That's pretty crappy imo. I mean, if someone pays for something, it should be right. If it's not right, ethicallly the originator should make it right. Maybe I'm old school, but that's my .02. From a corporate standpoint, however, I can understand why something of that nature would have to be in place. A company wouldn't be profitable if they had to fix every single thing for every single customer. We, the knit-picky people that we are (ESPECIALLY myself included), would hound them anytime ANYTHING went wrong, and GOD FORBID we get to do it for 3 years (a la AppleCare), causing them to have to increase their workforce listen to me complain to on top of eating the cost of part replacement and lets not forget the labor and potential overtime costs that pay and feed the technicians families for doing the repair. Is it right? Not in my opinion. I think that a company should stand behind their products 100% and not make "rules and loopholes" to get around having to make things right when a product isn't. No one ever said I liked corporate america though. A perfect example of this is when you have "service advisories" vs. full blown "recalls" on cars. It takes a overwhelming series of complaints before a company will acknowledge any fault in their products or themselves and eat the cost to make it right. (Microsoft Xbox 360's ring of death or power supply malfunction anyone?)
I've found that, as a consumer, standing up and explaining your situation is key to getting the satisfaction you deserve. Should you have to live with 1 dead pixel? I don't think so. Even if you can't see it, it shouldn't have been there. But if there is a "pixel rule", in theory you would be SOL. But if you purchased this thing with a dead pixel, which in this case you DID, (and even if you didn't...shut up, yes you did!!) I would see no reason why they wouldn't be able to swap it out for one that was working correctly from the start.
My advice, give em a call or go to the apple store you purchased it from (assuming that's what you did) and talk to them. Dont' go in there ranting and fuming, but explain that you're disappointed that you purchased a defective product (yes it was!) AND THIS WAS YOUR FIRST EXPERIENCE WITH AN APPLE COMPUTER. (shut up, yes it is!!) My guess is that they would like to make it right with you, because Apple computers is all about "switchers". And what happens if people stopped switching? Well...the Apple sits in the fridge and rots.