Yup, sound right, any other niche is so low on grav and it seems that not much new product for other niches except for making money niche and health niche.
I agree that it depends on what niche you want to promote, then again if you look at it closely everybody wants to promote the top 10 CB products, which makes the competition very stiff. I am sure there is a way to find high search vol low competition CB products. I asked the question on another thread, if get good answers I will refer you to them.