For now I've earned a little over $30 by this method. It's not good enough but I think that I know what I did wrong.
At first product need to be high-priced as a lot of people mentioned before. I reviewed on my website a lot of under $100 which is not too expensive. Also I did articles like "top 10 XXX" which also doesn't really work for forums as best way to post is something like: "Which product should I buy? X or Y?" and you can't do it properly if you have only articles like "top 10 XXX" and no single products review.
Here's my question to
@WhitePassion - You said that on the forum you also use face from blog. So how looks this post from "expert"? First post is from newbie like "I don't know which product buy. Help me: X or Y?" (with links to expert website). And then expert comming in and says "Pick X, it's better. Bla bla bla". Is it not too suspicious that someone (the newbie guy) putted before link to this specific expert website? And second question you also post links in expert reply or just recommend?
These answers could be very helpful for me, thanks!