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Personally, I'd be careful about throwing the baby out with the bathwater there. During most of October my EPC was a shocker - an average of .03 with the daily EPC dropping down to 0 for a long run of days. Towards the end of the month I started to get .30+ EPC days. This rise in EPC continued on through the start of November. The last EPC posted on my dashboard is 1.13 with the one before that being .96. My average for November so far is 0.57. Whether this will last I don't know, but it's certainly encouraging. To achieve this result, I tightened my sites up a bit with better keyword targeting, and dropped the auction back-end on one generalaized site that was getting a large number of un-targeted clicks. I also dumped some other sites for high ticket items. The keyword targeting mainly just involved adding the word 'buy' at the start of the product description in the page title, to get more consumer oriented traffic. I also switched to generating the product links using Javascript and innerHTML (after checking that this method correctly passed referrer information), to prevent bot clicks. Also, I stripped the 'http://' header off the product URL when embedding it into the page source, to prevent bots from recognizing the link, and then added it back when I wrote out the link using Javascript. Don't bother with reactive methods for dealing with bots (such as IP banning) - you will just end up chasing your tail. So basically, try tightening up your sites, and dump any campaigns that are too un-targeted or poor performing.
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