All the little bits of money you earn through those channels can make up quite a nice sum after a year or so. Remember how I said that starting a passive income business either a lot of time or some money, or a bit of both? Well, mobile apps offer the best of both worlds. With a little time and a little money you can have an app developed and on the App Store in literally a week.
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.
Domain names cannot be replicated. If one is taken, the only recourse would be to approach the owner to discuss a sale. While there are other variations you could choose, sometimes owning a certain domain (especially if it is attached to your business) can be worth the premium. Often, people will scout out domain names that are still available, buy them, and then sit on them in order to sell them down the road. Depending on who may want the domain down the road, you could sell it for a large markup.
Also, I know from my personal experience that when you only do something because you think it’s a money-spinner you end up nearly killing yourself to get the idea over the line. I remember creating a careers advice site that bored me to tears. Every word I wrote, hurt a little. All 200,000+ words! Do not put yourself through this pain. I know I won’t ever again.