Building micro niche websites is simple, only the term is new it basically means making a lot of 1-10 page websites or blogs in different niches "Topics" with unique helpful content that's not duplicated in Google and of course doing some SEO like submitting to directories or spamming it in comments "For Black Hats, perfectly illegal so avoid it", and of course monitoring their stats using a simple counter or Google analytics.
you make money from random micro niche websites using AdSense by perfectly placing your ads on your static website inside articles, above posts and in sidebars above menu.
you can also make money from a Micro Niche site using affiliate links, Amazon, clickbank or simply offering coupons.
A small micro niche might get large amount of visitors and then it's time to move and grow it up and add more content for that particular website.
You can never guarantee success in micro niche technique, for me building few blogs but growing them larger by writing content or even copying and adding some spice is better and makes more revenue from whatever monetization you use.
Sometimes Google takes micro niche sites as spam, cloacking, or crap content so be unique and make sure the website is useful for the reader, remember always that "your visitors is not always robots".