The good point when it comes to promoting a micro niche is that you are targeting real visitors compared to general topics where you might even forget you have that particular page in your website which is only collecting dust.  While micro niche receives only few visitors, you can generate more money form them because these visitors are all potential buyer where in return could make real money too.

Another good point to consider is the promotion.  Promoting a micro niche is not that hard compared to that website having multiple niches.  Since you are only promoting a single topic, you will only be having a 2 or 3 or let say 5 keywords to target.  Five keywords or key phrases I think, is too many but if you can handle the promotion, the more keyword you will target the better.

Another good point with micro niche is that there are only few competitors to compete with.  This means you will be having potential to generate income online.  And when it comes to adsense, advertisers are paying more about their products.  Of course, the adsense PPC amount will vary depending on the niche you will be creating.

I would like to suggest you use a powerful keyword tool to locate those long tail keywords you will use to compete over those other websites with the same niche you will be utilizing.  Check out the powerful keyword research tool over my sidebar.  Don’t miss this out as it will be chance to make more money through the internet while working at home.