It depends on what you sell, how much profit you make per unit. If you stand to make a large profit from a single sale then a click is worth more to you.
Also, if the directory page where you link will appear is strong then it has more value from an optimisation point of view. If the directory is somehow topically related to your website content then the link will also have more value to you.
Based on what I've just said, only you can decide whether the cost of a link in financial terms is offset by the benefit gained from either traffic or improvement in SERPs.



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