Quote from Jayford:
Just the opposite. If you have a 15 pip risk, and average 50 pips on your gains, you don't have to be very accurate (ie high winning %).
You do have to be accurate as far as picking the correct spot if that is what you mean. I think that's always the case unless your stops are way out there. When I place trades its usually at obvious supp/resis, so ya know pretty quick if its going to work.
My original statement on accuracy was aimed at scalping. Since scalping wins are so small, and you are fighting the spread, you must have a very high winning % to make any money. I've done it both ways, and personally, I think scalping is much harder.
Sitting on your butt waiting for a trade can be tough also however.
Jay