Does Advertising on Yahoo Search for 'Dating' Vertical stink for you too?

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Ive recently started working on a ppc campaign for a set of niche dating sites. They have a google campaign and a yahoo campaign.

In a really basic nutshell kind of way;

The google campaign works. decent ctr and conversions respectable conversions.

The yahoo campaign is kinda like, dead. of all of the clicks the ads have recieved non have converted. None. Zero. I cant quite understand the difference in quality of clicks between the 2 sites.