Google does not make money in free organic listing. Well, not directly. Consider it a loss leader. If Google searches did not produce results, you wouldn't go there in the first place. Consistent visibility of your business products and services in the Google 1st page placement competes with Google Adwords - the paid listings. To add to that, most people consider the "natural" listing to be more credible.

It's been said many times, the only constant in this world is change. Google is no exception. It's the very reason I have a job at all (so thank you Google). I deal with this on a daily basis. Just so you can see it for real, here are the major Google updates in their relatively short history (minor updates happen so frequently that it's ridiculous to even enumerate them).

So much is changing and happening so quickly - staying on top of Google is a full time job!

·         September 2002 - First documented update

·         February 2003 - Boston update

·         April 2003 - Cassandra Update

·         May 2003 - Dominic update

·         June 2003 - Esmerelda update

·         July 2003 - Fritz update

·         Google Dance Ends

·         September 2003 - Supplemental index

·         November 2003 - Florida update

·         January 2004 - Austin update

·         February 2004 - Brandy update

·         January 2005 - The Nofollow

·         February 2005 - Allegra update

·         May 2005 - Bourbon update

·         June 2005 - Personalized Search started

·         August 2005 - Google files patent for Agent Rank

·         September 2005 - Gilligan update

·         October 2005 - Google Local/Maps update

·         December 2005 - Big Daddy update

·         November 2006 - Supplemental update

·         May 2007 - Universal Search Update

·         April 2008 - Dewey update

·         February 2009 - Vince update

·         August 2008 - Google Suggest update

·         February 2009 - Rel-Canonical update

·         August 2009 - Caffeine preview

·         December 2009 - Realtime update

·         May 2010 - Mayday Update

·         June 2010 - Caffeine rollout

·         August 2010 - Brand update

·         September 2010 - Google Instant update

·         November 2010 - Instant Previews

·         December 2010 - Social Signals

·         December 2010 - Negative reviews

·         January 2011 - Attribution update

·         March 30, 2011 - +1 button

·         June 2, 2011 - Schema.org

·         June 28, 2011 - Google+ launched

·         October 18, 2011 - Query encryption

·         November 3, 2011 - Freshness

·         January 20, 2012 - Search Plus Your World

·         February 24, 2011 - Panda Update/Farmer

·         April 11, 2011 - Panda Update 2

·         May 10, 2011 - Panda Update 3 (2.1)

·         June 16, 2011 - Panda Update 4 (2.2)

·         July 23, 2011  - Panda Update 5 (2.3)

·         August 12, 2011  - Panda Update 6 (2.4)

·         September 28, 2011  - Panda Update 7 (2.5)

·         October 19, 2011  - Panda Update 8 (3.0)

·         November 18, 2011 - Panda Update 9 (3.1)

·         January 18, 2012  - Panda Update 10 (3.2)

·         February 27, 2012  - Panda Update 11 (3.3)

·         March 23, 2012 - Panda Update 12 (3.4)

·         April 19, 2012 -Panda Update 13 (3.5)

·         April 24, 2012 -Penguin

·         April 27, 2012 - Panda Update 14 (3.6)

·         May 25, 2012 - Penguin 1.1        

·         June 9, 2012 - Panda Update 15 (3.7)

·         June 25, 2012 - Panda Update 16 (3.8)

·         July 24, 2012 - Panda Update 17 (3.9)

·         August 20, 2012 - Panda Update 18 (3.9.1)

·         September 18, 2012 - Panda Update 19 (3.92)

·         September 27, 2012 - Panda Update 20

·         October 5, 2012 Penguin #3       

·         November 5, 2012  - Panda Update 21

·         November 21, 2012 - Panda Update 22

·         December 21, 2012 - Panda Update 23

·         January 22, 2013  - Panda Update 24

·         March 15, 2013 - Panda Update 25

·         May 22, 2013 - Penguin 2.0        

·         July 18, 2013 - Panda Update 26

·         September 2013 - Hummingbird

·         Oct 4, 2013 - Penguin 2.1