I took get spikes of suspicious traffic. But not only from looksmart from all ppcs, with the expections of google, overture and searchfeed. Profits from ppcs are not constant, and I do take losses on some campains in some periods of time, but looking at it from a one to two month ROI tracking, I do well. I find sometimes I have to hang in to a specific ppc, then the trafic gets better.
I would sugest that if you are getting any ROI at all, keep in there. I have seen spikes in goclick traffic and once they even re-emberced me for some traffic they admited to be junk. Even with the spikes I do well. It took me quite a bit of time of breaking even and loosing from kanoodle and enhance before I pulled the listings.
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