How do you choose the clickbank product? Gravity ?

Anyone can tell me what the rules to choose the clickbank products for promotion?
I know it based on keywords and gravity value. But what kind of niche keywords are worth to promote ? What is the minimum gravity value to pick up your clickbank product?

Thanks.

I chose the products that have a gravity of 100-200
anything above that is way to competitive

also try :

gravity is definitely one of the main factors you should look for but another is the commission you get to. i dont go for any with a commission less than 60% and gravity less than 75.

Personally, I go for products with gravity between 50-75. This means that the sales pages can definitely convert, but the competition is still quite low. Some of these products are in obscure niches where you can do quite well.

Of cooourse, a lot of people swear by the other end of the spectrum. Why re-invent the wheel when you find a product with a gravity of three hundred? You know its converting, and converting well... so just jump on the bandwagon and ride the wave.