Everyone says for a membership site you get maybe 1:6000 on this kind of traffic (the premium US kind). You'd need to see 1m hits tested to verify this, and I don't see anyone willing to do that. If someone would post stats, from the same site, on 50k text link vs. 1m premium US popunder: cost, convert ratio, retention after 3 mos, etc, we'd be able to settle this question.
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