Ok Mr. Kindergarden, here is some basic math for you.
You win 10 trades of 5 dollars each, you now got 50 bucks.
You lose 1 trade, not 2, not 3, but 1, and you lose BIG, considerably speaking vs your winners, say you lost a whopping 30 dollars, 6 times larger than your winner.
50 - 30 = 20...