Also the comparison to Brad Pitt really makes no sense. People don't go to see Brad Pitt moves because he is an x times better actor than others. Not saying he is bad, but surely some cheaper nobodies could be found who acts well, too. But they wouldn't be famous and therefore would not draw a crowd.
Same with Salieri. Sorry, but there are zillions of programmers who could program a Twitter, for example. Sure, there are some kinds of programs that most programmers would be unable to write, but it doesn't apply to most Web Apps.
Even if the programmer thing would make a difference, the business guys still could not possibly care, because they have no way of knowing if a programmer is good or not.
Think about building a house. Once the architecture is done, surely there are lots of building teams who can build it. Sure, some will screw it up, but most won't.
Also, I think in the beginning the business guys might be looking for a prototype. If it takes off, they can still worry about finding rockstar programmers.