Made $104,000 in revenue since June (turns out the user acquisition stuff actually works), about 87k of which is profit, so we'll say ~$11,000/month part-time. It still makes me a solid $2,000/month now with zero work, and hopefully more once the book is officially published. (It's done and delivered to backers, but won't be on bookshelves and Amazon until after it's typeset.)
https://www.indiegogo.com/projects/the-ultimate-growth-hacki...
I know the marketing will be over-the-top for HN. Just know it sells because the content is really, really good.