Escaping from ourselves.
Look at Gareth Gates. The more famous he became, the more severe his stutter turned to. - Why? Because it's not success we want. With his success, the abyss between his phobia-led personality and his popular image became wider and wider. Finally he had to stop singing to work on his speak. Now he started over singing again, and here comes the videos of his terrible speak. (I know I shouldn't generalize, but I claim that this is how these things are.) - It's not success we want; we take to success, instead of something else we barely even know what it is.