Profit is not a behavior; it is an outcome. The degree to which traders consistently adhere to their rules under various circumstances is a measure of their discipline.

Companies and serious traders assess trading based on execution quality, management of risks, and trading habits. Speculative profits may mask trading habits while disciplined losses are an indication of good trading processes. 

Thus, discipline in trading will determine long-run survival and growth.

Instead of erratic performance spikes, traders want consistent execution and not fluctuating performance. 

Moreover, accountability is promoted by measuring discipline. Over time, disciplined traders perform better than unpredictable ones.