Quote from Cutten:
Is this justified do you think? I mean if you are worth 1 million and wanna risk 20% of your net worth, why would you suddenly want to risk 60% of your net worth just because you had a good year and got to 2 million? Why does your risk tolerance chance from 20% of net worth to 60% of net worth?
IMO treating open trade profits as "the market's money" simply means that your risk tolerance fluctuates massively according to the distribution of open vs closed positions in your portfolio. From an economic & utility point of view, open profits are identical to closed profits.
It's basically an excuse to, fairly arbitrarily, massively increase your risk tolerance in the market. Someone who is risking 60-70% of their portfolio on drawdowns is clearly going to make much more during good times than someone who risks 20%. But they are going to be exponentially more likely to blow up (e.g. during an Oct 87 style gap move), lose investors etc. Gap moves happen, and during crashes or market shocks, market correlation increases massively.
The only consistent approach is to treat open profits the same as closed profits. There is no such thing as "playing with the markets money", it is a psychological fallacy. If you want to be a high roller, then be one based on *market conditions*, not whether your profits are "open" or "closed" (they are still the same in dollars and %).