Internet marketing people are everywhere; you can't throw a rock on the web without hitting one. They've all written the definitive book, whitepaper, webinar, podcast, or whatever about how you, too, can make a bazillion dollars on the web, and for a mere $495.72, you can know their personal secrets. Yeah, whatever.
Some of them have written actually published books. I usually peruse them at my local Barnes and Noble for free, and if I find them interesting, I check them out of my local library, which is also free. You can learn a lot for less than $495.72.
One of the interesting things I learned about was a service called Payloadz. On Payloadz, you can upload your information product, be it how to compost with worms or how to make that aforementioned bazillion bucks, and make it instantly available to the entire world, day or night. You simply build a web page for your product, provide a link for them to pay through Paypal via Payloadz, and that's it. Payloadz handles the payment and download stuff. All you do is transfer the money from Paypal to your bank account and go merrily on your way.
It sounds too good to be true, and to some degree, it is. First you have to produce an information product, presumably on something about which you know a little bit. Secondly, you have to key into an audience that is actually interested in the information you've produced, be it worm composting or Internet marketing, which, when you think about it, are pretty much the same thing.
I wrote a study on Homophones for teachers and homeschoolers, which sells occasionally, although I think the actual number of people with a keen interest in English Homophones is likely pretty small.
If you have no real body of knowledge, and no inclination to produce an information product, it's not a problem. Lots of products on Payloadz have an affiliate option, so all you need to provide is enthusiasm and a web page with the appropriate links. Then just sit back and rake in the money. Or not.
There is still the issue of finding the significant number of people out there who are desperate for information on homophones or worm composting or Internet marketing, which is discussion for a different day.