Amateur to Professional = Opportunity cost

 Another way to see things in professional terms is to evaluate things in opportunity cost.

The amateur and professional equation could be a thing between of the decision-making that let's monetizable stream of attentions flow into the pro, once it's starts working though, (which is a miracle if you do the math of how many succeed). Then things start to make a full-time living of it.

All this worth is with monetisation as a by-product; a symptom of the commitment. It's the work-ethic of the gradual shifts of new markets coming out then falling out.

Not that they are opportunistic, they are consist and pure into their pursuit, understanding the industrial and consistent progress.