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another figure would be better for comparism, such as unique visitors to the gallery per sale, as you could in- and decrease your CTR through making the links on the gallery less or more blind - with the corresponding influence to sponsor click through / sale ratio.
or better yet, $ per k visitors after bandwidth
a little over $1 per 1000 visitors to the gallery for me (with bandwidth already deducted),
about average I guess?
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