Micro niche site method is still working?

Micro Niche sites just seem to be too much time and effort to keep up. My preference would be to invest more time and money in only a few sites and then focus the SEO on those - instead of trying to SEO 50-100 sites. For the amount of time and effort required (assuming you are in this for the long haul) my 2 cents are for larger sites which you can grow over time if the site(s) warrant it. If you are looking for quick cash, try another method.