The real reason a Third party vote is a wasted vote? You guessed it, the big two.
From
http://www.foxnews.com/story/0,2933,446152,00.html "Bob Barr has no chance of winning the election. But regardless of what you may think of his politics, or that of third-party candidates like Ralph Nader or Chuck Baldwin, this system is rigged. The two major parties have effectively cemented their grip on power by creating laws that make it virtually impossible for upstarts to compete with them. They have effectively done with campaign laws what federal business regulations tend to do in the private sector - protect the behemoth, entrenched dinosaurs that dominate the industry by making it too expensive and difficult for anyone to challenge them."
Go read it. And the fume at the horses asses that hold office.