I'm currently planning to try to so sell audio- and video courses online (mostly through email marketing). It's a small niche that only gets a couple of thousands of searches every month but since I make the courses myself and sell them for $55-60 I think the project may have some potential. The people who search for the niche are usually also quite willing to spend a fair amount of money. I wonder if anyone else had success with selling "niche-courses" online? Would be interesting to hear some experiences, both good and bad ones, so I can prepare myself better.