rMBP is a waste of money you are basically paying for the high resolution screen!
Exactly, that is the most important reason this laptop is so attractive to many users. Yes, you get what you pay for, and you pay for what you need.
If you don't need/want an IPS screen with good color reproduction, then it might be a waste of money. If you happen to need one, then it's not.
There aren't that many options if you need a laptop with a high-res IPS screen that covers the whole sRGB space. Yes, there are at least some, like the W530 and some EliteBooks, but they are priced at equal level, or even higher. Oh, but hey, they have that extra USB port, so they must be, like, a whole lot more professional than the rMBP. They also weigh a whole lot more, and have shorter battery life with the stock battery, but hey, that extra USB port is, like, totally worth it for every possible professional usage case, right? And everybody needs that ODD too, because all of us professionals professionally read and write CD's all the time. 'Cause that's just what all professionals do, they connect peripherals and swap CD's in and out the ODD, all the time, everywhere, all day long, right? And those memory modules, man, of course all professionals swap them too, like, eight times a day. They wouldn't be professionals if they didn't.
I don't get it, why do some people have really hard time realizing, that individual needs vary quite a lot from one individual to another. That's why there are different products on the market. Saying for instance, that the rMBP is a bad product and the people purchasing it are sheep just because it lacks one USB port compared to some other laptop, is like saying, that a five seat car is a bad product, because you can't fit eight people in it. Silly. Horses for courses.