You are correct, if someone reads all the post, its clear. But the numbers are so large than even a small percent of skimmers reaching the wrong conclusion is damaging.
In this economy, few can afford to jettison customers because they are ignorant. That's his choice though.
Ignorant is easy to cure with 10cc of good information and 10cc of reasoning. Willful ignorance on the other hand is not curable. I don't see why any sane reasonable person would want to deal with willfully ignorant. In fact there is a whole slew of people who sell exclusively to willfully ignorant (James Van Praag is good example) but I put them in the pile of scam businesses.