As of 2011, the most expensive domain name sales on record were:

Insure.com 2009 $16 million
Sex.com for $14 million in October 2010
Fund.com 2008 £9.99 million
Porn.com 2007 $9.5 million
Fb.com for $8.5 million in November 2010
Business.com for $7.5 million in December 1999
Diamond.com 2006 $7.5 million
Beer.com 2004 $7 million
Israel.com 2008 $5.88 million
Casino.com 2003 $5.5 million
Toys.com: Toys ‘R’ Us by auction for $5.1 million in 2009
AsSeenOnTv.com for $5.1 million in January 2000
iCloud.com by Apple for $4.5 million in April 2011
Altavista.com for $3.3 million in August 1998
Candy.com for $3.0 million in June 2009
Wine.com for $2.9 million in September 1999
CreditCards.com for $2.75 million in July 2004
Autos.com for $2.2 million in December 1999
Casino.tt for $2.0 million in May 2011
microsoftco.com for $2.0 million in Jan 2012

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— I thought this snippet from wikipedia provided an interesting insight on the human race today…

(Source: Wikipedia)