Ken Grant is a risk consultant to many of the super star traders & firms. He reviewed raw brokerage records of the best traders and this is what he found:
"Across all market conditions, trading styles, time frames & traders, one rule holds true: 5-10% of all trades account for 90% of profits."
"I know of many portfolios that are so effective in their actual trading/execution and risk-control practices that they make large sums of money in a consistent, risk-adjusted manner with win/loss percentages in the low forties or below. The trick, of course, is to make sure that your winners pay off at higher multiples than those of your losers."
High win rates appeal to the human desire for comfort & loss aversion, doing what is comfortable will never never make you a profitable trader.