[betenoire]

There is so much SEO information and misinformation out there, I don't think "common sense" isn't a useful way to look at the industry.

I don't mean to put words in your mouth, but I've seen this type of question many times and the subtext often suggests that a need alone isn't enough to justify an industry. It's a service, and one many people would rather pay for than spend their time learning and doing.