[pcthrowaway]

(not the person you're responding to) If you're offering free, perpetual hosting, I think it's worth 20% of sales for the creator (who doesn't know if they're even going to sell much, or if the material will become outdated and stop selling in a few years)

I wondered how the creator of this course could guarantee the course would be available forever, and what a headache it must be to continue to maintain the hosting/content if sales taper off. Outsourcing that job to a service which is hosting many such courses (and with new ones continually added) makes a lot more sense here, and of course you have bills to pay too. That 20% commission isn't just covering the cost of time you put into the course builder and hosting now, it covers hosting in perpetuity.