Trading generally brings lower quality traffic than say the search engines would. My opinion is that Google brings your "Bounce Rate" into their algorithm. So, say your trades bring you 60% of your traffic and 90% of those visitors leave within the first 30 seconds, Google will likely rank you lower than you had been before. This is purely an example, but might be something to look at. Personally I have always preferred minimal SE traffic over lots of traded traffic considering it converts 100x better.

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