Turtleviper,
By saying that most people prefer day trading I am not knocking day trading. Actually, there are a lot of successful day traders that consistently make $1000-$5000/day. By stating that most people prefer day trading this just means that most people don't have the patience to trade the trend, majority of people prefer the quick action for the small buck, I prefer patience for the big buck.
If you miss the few big trades that arise with the turtle system you definitely won't (will not) make money. It's very easy to have 10 losers in a row and then one huge winner.
I trade a variation of the turtle system, it works a little better for me and I feel it increases my winners to losers ratio, but this ratio still isn't much better than 50%. Therefore your winners must be, on the average, much bigger than your losers.
Hope this helps you out.