Why must I deduct anything? I only go in for the trade. I only need to add up the profit I make on each trade. You fail to mention when the stock goes down to $2.50 and I buy it, I don't buy more. Still just buy for the trade. Doesn't matter how much I put into initial investment only how much I make net on each trade.
I don't only just daytrade, I position trade, swingtrade and have one stock I hold long term. I only daytrade on stocks with heavy volume, using a % of my portfolio.. For the most part I position trade NOT.