I think it just depends. I corresponded recently with a nice lady who has an ebook on training horses. A very particular type of horse and I can't remember the kind of horse because horses don't interest me one bit ;-)

She's making a decent living with it. Not a fat 6 figure salary but enough to supplement her and her husbands income.

Could I make a penny blogging about horses or selling horse ebooks? Nope. Not one cent.

I focus on the natural health/natural cures niche mostly now. It's what interests me.

But generally speaking, most IM'ers focus on health, wealth and relationship niches. I suppose I'm in a subcategory of health.

I made my income by CPA. Even if i were to lose everything one day, i know i can build up my business with CPA anytime. Anyone can do it as long as you know to to do it and what to look out for. Some people i have taught has made a profitable income in just 2-3 months.

Definitely, "weight loss".
Ive made thousands just with single websites there.

Maybe its because I make my websites mainly in Germany for "german google", so maybe there is less competition.

But anyhow, this is the best niche for me.

The most popular ones for me have been 'making money online' and 'health and weight loss', I think it helps if have an interest in any niche you try and master.

These niches work best for me.

Biz opp / Internet Marketing offers
Weight Loss / Fat Loss products
Coupon / Free giveaway offers