> that's less than what a junior engineer would make even if they never got any raises You have to factor in how much time you spend on the content for it to b

> that's less than what a junior engineer would make even if they never got any raises You have to factor in how much time you spend on the content for it to be comparable. A normal tech US salary job would be 9am to 6pm and maybe 15-30 days of PTO a year. If you have a course or book that made $500,000 over 9 years, you might have spent 4-5 months making it up front and then XX hours per year for support and keeping it up to date. The return doesn't sound bad if you spent 40 hours a year on it. That's 320 hours over 8 years or roughly 2 months of full time work.