Answer posted to Quora:
You only want to hire someone that can deliver Organic Targeted Traffic. You want visitors from potential clients.
Traffic, Clicks and Hits all mean nothing if you are not seeing an increase in Sales or Conversions.
Traffic, Clicks and Hits will hurt your website if they are fake or from people not interested in your website because they will quickly leave which increases your Bounce Rate and leads Search Enginges to belive your site does not deserve a First Page placement because your site is not interesting enough to hold visitor's attention.
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