Quote from kut2k2:
Seeing is believing. I have to see significant profits being derived from a randomly generated series before I believe it.
Take a look at G-Bot, seriously.
Or lets do a simple thought experiment. Draw 2 horizontal lines on any chart somewhere in the vertical middle. Buy when it hits the lower line and sell when it hits the upper line. See how many trades you get, and average that on about a 1000 different charts - picking just one bad one will not work. If you hold onto the position for a long time during a drawdown, you constrain your capital, but eventually it comes back (most of the time). If you do this for about a 1000 symbols at once, it's highly unlikely all of them will trend out of range at the same time.
You can also move the horizontal lines at your discretion and use stops, this is where statistics and risk preference comes in. If you have $200M and you trade only $1M, leaving the other $199M for drawdown, it could in theory work.
It's like chasing butterflies. If there's a 1000 of them, you set the nets at random places and eventually you'll catch something - when they pass through the net area (like price passes through your horizontal corridor area).
Disclaimer: It would be a really stupid plan, but i'm just illustrating a point here about trading randomness, not suggesting anyone trade like this.