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by asicsp 1429 days ago
I'd assume 20% covers payment processing fees, collecting VAT/etc where appropriate, and so on.

As a comparison, Leanpub charges 20% for books/courses (not sure if those courses are on par with the features offered by tigyog). You'd get better pricing with Gumroad, but no interactive features on that platform. 20% is more than fair in my opinion.