Well, Amanda Hocking addresses that issue in her blog here. I especially like this comment
So much of what people are saying about me is, "Look what Amanda Hocking accomplished in a year," when they really should be saying is, "Look what Amanda Hocking accomplished in twenty years." Because that's how long I've been writing, that's how long I've been working towards this goal.Sounds a little familiar to me. Like the old Hollywood stories of the actor or actress who was discovered and becomes an overnight success ... but fails to mention the years and years of hard work in training and taking small roles that led up to the discovery.
Committed writers shouldn't give up their dreams of self publishing, but it doesn't hurt to go into the effort with your eyes wide open.