Analytics use javascript, if people do not have java enabled, they will not be counted.
Bots do not use javascript and are not counted either.
I think I read somewhere that a user needs to stay 3-5 seconds on the site for Analytics to be able to count them.
Traffic you buy might not be real clicks with expectations, it can also be some forced traffic, which usually is no good.
Analytics try to count real users, so while your server log will show hits and visits from Google search bots and others, Analytics will ignore those hits. Which is one reason for server stats and Analytics to never match, there will always be a descrepancy.
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The truth is not affected by the beliefs, or doubts, of the majority.
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