The Most Expensive Domains Ever !
Check out the bestseller domain prices
over the last years:

Copyright 2016 - Most Expensive Domain Names
Poker.com
Poker.Com is probably one of the most desirable and valuable domain names in the world ! Poker.Com (who describe themselves as 'The Home of Poker') can best be described as an online poker portal. The majority of revenue appears to be derived from affiliate deals.

In 2007 the world's most searched domain name was under the hammer at a Moniker.com silent auction. Bidding opening offers of $22 Million and $28 Millions were made, which could have made it the world's most expensive domain name ever at that time!
But no buyer or price was reported and the sale was never confirmed. Months later an indicator of a change in ownership came when the site began displaying Full Tilt banners as opposed to CarbonPoker.

Today the site advertises a total of 14 poker rooms and 4 of these drive traffic to the MergeGaming network.

Source: Pokerupdate.com