Before this i'm promoting low gravity product, and when i got extra money i tried promoting high gravity product (range 60+ and above) but seem a bit hard compare to low gravity product. But as you know, when gravity is high, the potential of searches high. Means that people know about the product and they will google for it. So its winning for ppc / seo. Whose who make ads about product + review will makes money (I already did it). But when it comes to high gravity, you can see many ads on google. Is that "money makes money" - those who has money, bid high and good converting page will bank hard. Any ideas?