What Packt pays its course authors revealed

I was made aware of this posting by Packt on Upwork. It seems that they pay their video course authors $1000 and a 16% royalty for a 3-4 hour video course.

This seems to be comically low. Packt seems to have a reputation on HN for being a "lower end" publisher, but this puts those $10 fire sales they have on content in a new light.