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Well, I can tell you just from MY experience. I have mostly ebony niche email traffic. My conversion ranges from 1:200 to 1:450 depending on what I am promoting.
These bigger guys probably make a ton more money because 1) the list is bigger 2) they send out upwards of 4 mailings a day.
Then again, their costs are larger but probably diluted by the economy of scale they operate on.
I only send out mailings when I have new content.
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