Gravity: Number of distinct affiliates who earned a commission by referring a paying customer to the publisher's products. This is a weighted sum and not an actual total. For each affiliate paid in the last 8 weeks we add an amount between 0.1 and 1.0 to the total. The more recent the last referral, the higher the value added.
Of course not, but I assumed the OP had already read the Clickbank description of what gravity is before coming here. webguy84, the more sales a product gets as a result of affiliates, the higher the gravity. If hardly any affiliates are selling it, and even if the owner of the site is making good sales on their own, the gravity will still remain low.