There is absolutely nothing wrong with it. There is obviously a market for them and likely are people that value their time more than say a hundred or two hundred dollar mark up, which let's be honest isn't much.
Everyone knows the game and has a fair shot, sans NYC. Get there at an obscene hour in the morning and wait. To begrudge someone for doing what "you" can't or won't is just silly IMO.
Filling up the lines and buying up stock so that I have to get up at ungodly hours or pay a $200 markup (A 40%+ markup on a $500 iPad isn't high? Not everyone has pockets full of cash as you clearly do), is still an underhanded and crappy thing to do. You can twist it any way you want so that you can keep your conscious clear, but the bottom line is that people doing this are not only taking advantage of the problem, they are helping to create it. I think it's just the fact these aren't people simply taking advantage of a situation they have no control over, but people who are in fact contributing to the problem in the first place.
No matter how much you justify it, these aren't examples of capitalism, these are outright leeches.