A few of the easiest methods are discussed here.

Sell Ads Spots :

• Niche blogs grow into worthwhile assets over a period of time. Following some initial work, most blogs are able to automatically generate backlinks that create a good amount of traffic and an adequate page ranking of PR 2 or 3 on Google search. Hence an easy method of making through the blogs is to have “site-wide” links for which you can charge a reasonable monthly fee.
• Of course the fee varies with the relevancy of the content on your blog. You could make quite a neat amount with a network of blogs. For example, if you have a specialty blog of PR3 ranking on Google with approximately fifty visitors each day, you could sell one ads spot for a fee of about ten dollars a month (which is probably the least amount possible).
• Selling five such ads spot, two on the sidebar for a higher fee and three in the footer area for a lesser fee could easily fetch you fifty dollars a month. And this is just the passive income.
• You would obviously need to spend a little time say every week or so to maintain the blog content, sell the backlinks and ensure that the site is working smoothly.
• If you could successfully earn fifty dollars from a single blog, imagine what ten such niche blogs could do for you. You could easily be earning over $500 a month without so much as breaking a sweat.

Affiliate Offers:

• Affiliate marketing is similar to the multi level marketing that some companies indulge in, in the real world.
• It is a good way of earning money through your niche content blogs too.
• After having established your blog with back links and traffic, you can put up affiliate banners like that of Click Bank which could help you make a few sales every month. So the more number of blogs you have, the more money you would be making.

The other methods of making money would be through a “service demo for other blogs”, add- on or selling primary products for sites that offer membership.