The downside is the content may not be on your niche. If you’re lucky like I was with the history niche, there will be others who write on similar, complimentary topics. There was one history writer who covered mostly the Wars of the Roses, while I covered the Tudors and the Stuarts. We worked together quite well to help grow each other’s audiences.

This sort of falls between creating a blog and an online course. The information can be presented on your site for free with affiliate links or through a subscription. How you earn income here will vary, of course, but the idea is the same as the other methods described above: Create something once and continue to collect income for months or years to come.
Monthly residuals are a wonderful method of increasing your income, getting paid for things you did in the past that continue to generate money for you. Those who qualify receive a check or electronic payment every month based on work completed in the past. Many sales and marketing people earn monthly residuals by selling a product or service that generates income months or years after the original sale. For example, you might sell a life insurance policy with a 10-year term. The insured pays his monthly premium religiously. The insurance company then pays the selling agent monthly residuals — a percentage of the monthly premium — for up to 10 years.
Jon, you always keep it real and I LOVE that about you and your writing! You are so right! There’s always an amount of work that goes into creating “passive income” or becoming a blogger who monetizing with services and courses. Thanks for being honest about how long it can take to truly master the required skills. Frankly, I’ve done my 4+ years of undergrad and grad school and what I’ve been learning in the last 2-3 years as I’ve dug deeper into improving my copywriting and blogging skills by taking classes with yourself and other trustworthy mentors is giving me the best foundation to help me build my freelancing business and ultimately step away from my 9-5. For me, it’s all about who I work for, under what conditions, when, and for how much, rather than a “no-work-at-all” lifestyle. That’s totally unrealistic. And I appreciate you, as a well respected “Guru” yourself, for saying so!
This was by far my biggest return on investment. It took about two weeks to figure out how to format my book for paperback and get setup for Createspace, but this is nearly 70% of my revenue. It’s ironic because my e-book is $4.99 and my paperback is $14.99. I priced the paperback higher because I wanted to drive readers to the ebook, where I could update it more easily. What I learned, however, is that many of the people buying my book are parents, not students, and they are more familiar with paperbacks. There is also an incorrect perception that you need a Kindle to read Kindle ebooks.
Admittedly, there are 100s of books out there covering the exact same stuff, but what I like about this – and in a similar vein to Get Rich Click – it’s the comprehensive listing and side-by-side comparison of all the different techniques and tips that I freaking love.  Once again, I know all the stuff in this book pretty well now, but I still run over it frequently to jog my memory and use it to work out whether I’ve covered all my bases – kind of like a checklist in that sense.