This Is The List of most expensive domain names by Wikipedia

Insurance.com $35.6 million in 2010[1]
VacationRentals.com $35 million in 2007 [2]
PrivateJet.com $30.18 million in 2012[1]
Internet.com $18 million in 2009[1]
360.com $17 million in 2015[3]
Insure.com $16 million in 2009 [4]
Fund.com 2008 £9.99 million[4]
Sex.com for $14 million in November 2014[4][5]
Hotels.com $11 million in 2001[1]
Porn.com 2007 $9.5 million[4]
Porno.com for $8,888,888 in Feb 2015[1]
Fb.com by Facebook for $8.5 million in November 2010[6]
Business.com for $7.5 million in December 1999[4]
Diamond.com 2006 $7.5 million[4]
Beer.com 2004 $7 million[4]
iCloud.com by Apple Inc. for $6 million in March 2011[7]
Israel.com for $5.88 million in May 2008[8]
Casino.com 2003 $5.5 million[4]
Slots.com 2010 for $5.5 million [9]
Toys.com: Toys ‘R’ Us by auction for $5.1 million in 2009[4][10]
AsSeenOnTv.com 2000 for $5.1 million [9]
Clothes.com 2008 for $4.9 million [11]
Medicare.com 2014 for $4.8 million [12]
IG.com 2013 September for $4.6 million, acquired by IG Group from Internet Group Brazil [13]
Marijuana.com 2011 for $4.2 million by WeedMaps, a subsidiary of General Cannabis Inc.[14]
GiftCard.com by CardLab for $4 million in October 2012[15]
Yp.com by YellowPages.com for $3.8 million in November 2008[16]
Mi.com by Xiaomi for $3.6 million in April 2014[17]
AltaVista.com for $3.3 million in August 1998
Whisky.com for $3.1 million in December 2013[18]
Vodka.com for $3.0 million in 2006 [19]
Candy.com for $3.0 million in June 2009[20]
Loans.com by Bank of America for $3.0 million in February 2000[21]

Source: Wikipedia