well let's assume i am trading with 1000 dollars. I have bought 1/4 of my desired position, which is half my capital, or 125 dollars worth. Keeping in mind my stop loss is at 1.8. Currently my risk is (1.1/2.9), 38% potential loss. so I am risking 47 dollars. On a percentage of portfolio basis that is 4.7%. At maximum holding, which I plan to do if the market does sell off, I anticipate that my avg price will be around 2.6 on the position. My potential loss is (.8/2.6), or 30% of the invested capital. If I am 50% invested, I am risking 15% of my option portfolio.
And the reward is 1.8, a 70% ROI, or 35% as a % of total portfolio.
As far as interest goes, if the fact that I don't disclose the size of my portfolio will mean that I will be only person paying attention, then that is fine. I personally feel that results are what matters, in % terms. The absolute dollar is relatively irrelevant for anyone but me. If I lose my 150 dollars, I will be the one left with only 850 to trade.