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Hi Chel,
When quoting I have been surprised a number of times when I might say something and the prospective customer will reply something along the lines of, “Oh yes, I read about that on your website”.
While your locals and even referrals may come your way seemingly directly, I *imagine* a good number of them have stopped by your site along the way.
Best way to find out is to ask them 
Your course could have a whole marketing approach devoted to it. But it would still not have to be separated from the other content, which, IMHO, would lend more credence to the course.
Cheers
Paul
