DislikedHere you go. I always post this link when the randomness discussion starts - I doubt anyone ever reads it but the proof is there (full text available at the link)
http://press.princeton.edu/titles/6558.htmlIgnored
So all of this about random walks is sort of a mute point. Nevertheless, it is interesting. This link that I posted, shows a strategy that can profit from a random walk.
http://www.isigmasystems.com/implications.html