It does happen often too that your conversion ratio is good enough to get paid per click but if you would get paid per signup you would earn less.
F.e. naughty-celebs pays $22 per signup. Their straight click rate is $0.04 per click.
This means you need a ratio of at least 1:550 to be better out using pay per signup. With my celebrity sites I'm usually just above this ratio, I have mostly a ratio of about 1:700 or something like that.
In this case pay per click is thus better than pay per signup.
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