I don't claim to be an expert, but I've been doing a lot of reading lately about article marketing over at Warrior Forum. As best as I can tell, the gravity number is a bit of sucker's game. It can be deliberately inflated and often is by purveyors of poor products. And once it's to a certain level, unwitting newbies flock to it and inflate it more. So you have a lot of bad ones with high numbers. However, there are many excellent products with gravities of 0. You should always scrutinize the product, their sales page and their refund rate (as reflected in their Earned Per Sale figure). It would be nice if picking a great product was as easy as just picking one with a gravity number in the right range, but you really have to dig deeper. For instance, does the sales page have both an email opt-in and a purchase button? Many do. This is good for the vendor, but maybe not for you. I suggest you look into product research a bit more.
I'm guessing you know about the charts and profiles at http://www.cbtrends.com/, but there's the link for anybody else interested.
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