I'm genuinely someone into these kinds of tricks and I invest quite modestly into all sorts of magic toys and tricks. However, I have a question - How are you going to make sure your users will keep coming back to you once they learn your trick? Most of the time, your users are going to be interested in only certain categories of these magic tricks and once they learn them, there is no incentive for them to pay for the following month. If you could add an online shop that sells all kind of magic stuff also, and if your courses complimented them, then it would be a good deal, I guess. Otherwise, your CLV would be very low. Just my thoughts.