Calm down, These questions are not baseless, That's why they were devised and are used in professional finance in the first place. Opportunity cost and time cost are variables used in valuation models. Using them for personal benefit is not such a bad thing. Surely if he recovered his money from the market and he is a winner. But it would benefit him to see how much it cost him to become a winner in the first place. What was the true cost of making profit in the market. THAT is the whole point of these answers. Otherwise if no one cared than there would be no finance academia.