I think gravity ( as related to Clickbank) is one of those things that can confuse people and that sometimes people pay too much attention to it.
I personally prefer physical products over what Clickbanks offers. But if one is trying to select something from Clickbank to sell, rather than giving a lot of attention to gravity a person probably should go for something on the first 2 or 3 pages of the listings that has a high referral percentage and low refund rate.
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