It's an old post tho I'd add my 50 cents. I plan to record more courses as I have lots of good material to cover. My 2 courses right now (same course in the English & Polish languages) are doing ok on a small scale. Of course, English version is like 80%+ of the whole deal. What helps is to do some marketing plus have some unique content. If you have something that 100s of people have then what sells? Brand, marketing, original content, your personality, price? Now this is subjective of course - I've been a ghost-writer for some courses and my clients usually want a 3-4h of content, not more, as those are animated courses and animation costs. If you go for black on white powerpoint with some pictures here and there then sure, it's cheaper to make, assuming that you don't need to do lots of research ahead of time.
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