Greed is a bad motivator to startup. A high profit margin is usually the last thing a customer wants.
It's easy to look at a startup space and see which companies get it, and which are there because the probability of success (due to focus on that particular market from acquirers and VCs, market size, etc.)
This article is kind of scary because people are taking the approach that entrepreneurship is something that everyone can do. I think everyone can try (and would advocate for it) but this type of attitude normally precedes many failures.
A company can be high-profit without a high-margin (i.e Supermarkets) or it can be high-margin without high-profits (many fashion labels).
Greed is a motivator for high-profits, not necessarily high-margins.
Every corporation should be in the business to maximize profits. A high profit margin should normally relate to a higher price which will lead to a less optimal acquisition and retention of customers. A larger customer base provides stability for sustainable growth.