Why do paid links violate Google's guidelines while other ads don't?

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Google gives penalties to sites who do paid links, but doesn't penalize site with other ads such as AdSense, Chitika, etc. Why? They both are source on income to a site, a site needs money to grow or sustain.
Net4earning, India

Google's guidelines on link schemes:
http://support.google.com/webmasters/bin/answer.py?answer=66356

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