Hi Trend,
You may be right in your observations but these observations disagree with what Lawrence McMillan calculated. Please see page 18 in "McMillan on Options," the second edition. The 90% number is an urban legend perpetuated by brokers who make money only when we trade (i.e., pay commissions).
Anyway, my recommendation to anybody is to read this book twice before trading options as one's main source of income.
AS