While true, this kind of analysis would still be useful for the allocation of that budget. You should still aim for maximum profit when you actually can calcula

While true, this kind of analysis would still be useful for the allocation of that budget. You should still aim for maximum profit when you actually can calculate that value and dump the rest of your budget somewhere else that makes sense but is much harder to quantify (market research, brand marketing). In any case, my experience is that "in the real world" is code for just giving in to systemic inefficiency and purposefully mismanaging your resources.