Modern Niche Marketing

The personal development niche has a spend of $500 million per year and rising.
The weight loss niche is worth up to $80 billion
Affiliate marketing spend in the United States alone is $5 billion
This all means that the potential to make a lot of money with the right niches is there and there is huge demand for high quality products that reveal how to do this properly. 
There are many people actively involved in niche marketing who are not getting the results they want and many more that are new to it and want to learn the best strategies.