It depends most of the overall income after all because if the advertiser does not gain much out of his campaign, meaning that he does not gain $xx per signup and gains just $x he will most probably go for CPC which would insure him filtered traffic as only those interested would click.
However if his targets are high and he has a pretty well made campaign with "expensive" outcome he'd go for CPM as it's much more attractive to the publisher although it may produce a lot of garbage traffic.
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