I agree with this. I left school because I realized what I wanted to do and it WASN'T I.T. administration.
I didn't want to end up at a huge corporation wearing a suit and hating my life.
Now I work doing what I love and I'm learning a lot from others using hands on experience.
Eventually I will start my own business which is what I truly want.
If you have a vision and the motivation; and you know you can do it without school, go for it.