Whether you want to earn money through direct sales, selling on eBay, niche blogging, article writing, bum marketing, etc. it does not matter. There are so many realistic ways to make multiple streams of internet income each bringing in just a few dollars per day. In fact, a visit to any WAHM forum will bring you all kinds of ideas.
I was in direct sales for several years but just did not enjoy it anymore. My favorite is affiliate marketing through niche blogs. That alone is great for multiple streams of internet income if you have several blogs going at once. This is just one of many ideas for working online.
Freelance writers are always in high demand, in fact many bloggers and website owners depend on copywriters for fresh content. If you have a flair for writing about topics you know about then writing could potentially bring in some decent money. Some writers only feel comfortable writing about specific topics while others are willing to research topics and write about them.
Think about the things that you enjoy doing and be open to learning new skills and you can realistically earn extra money with multiple streams of internet income.