[trotsky]

While I agree with the sentiment, the basis for the argument is clearly factually inaccurate. There are plenty of successful salesmen who sell products that cannot possibly benefit the buyer - c.f. boiler room operations, etc. When you ignore or distort obvious facts to make a much less obvious (but possibly true) point like "sustainable sales practices are more accretive over a long enough period" you make people who read your article wonder what else you say has been fabricated to support your position.

Let's flip it around: to give out good advice, you need offer it based on actual experience and not just suppositions. (not necessarily true either, but it sure seems like it would strengthen your argument)