ChocD again this doesn't make sense. If you're talking about random direction, then it could just as easily be the other way. So your statement amounts to saying that taking away spreads your chances in both directions are a lot less than 50%. Doesn't make sense.
Do you mean that the markets behave in such a way, that seems to work against most traders or against human nature? That I'd agree with.
ok the below should help. I am talking about the dumb flow, the dumb money. So lets take a typical dumb flow trade on 1 ES contract with a 10 tick stop. The trade is entered by mistake, random direction, random timing. Lets say the trade is closed at a random time later when the trader discovers he has made a trade by mistake and closed the trade.
now the are 4 possible outcomes when the trader realises he has made a mistake.
(i) The trade is in profit and he closes for profit
(ii) The trade is in loss and he closes for a loss
(iii) The trade is at break even and he closes for break even
(iv) ......................
I will let you fill in the blank for the 4th possible outcome when the trader discovers the mistaken trade.
now I think you would agree that the combined probability of (i) to (iv) = 1. It is safe to say that (iii) is very close to 0. It is also fairly safe to say that (i) and (ii) are equal in probability. The reason (i) & (ii) are substantially less then 0.5 is due to (iv). ignoring (iii). (i)+(ii)+(iv) = 1
now thinking about the market as a ZSG the dumb flow loses most of the time on random entry (ignoring spread/other nasties). the participants who on average make money from the markets by definition must take this money from the dumb flow (which isn't hard), you can then progress to thinking about how the dumb flow loses and how the winning participants win.
I hope that is of some use to you.
GTTY