There are lots of success stories around here and that's a good thing. However, in my experience, it's not a good idea to put all your eggs in the same basket. At some point, there will be a huge correction and a lot of people will loose money if they don't pay attention.
At the moment, I don't have too much, but I am a long term investor and only trade small amounts each day. I'm far from making a living from this, but I am getting there slowly. However, I don't quit my job to focus on this.