selling domain names

[alpine]

how do the sites sell the domain names. do they buy domain names before they sell them. how are they able to earn money by selling domain names. do they buy domain names at cheaper price and then sell them

[mustang]

i don't have the information of how they buy sell domain names but they keep their profits for buying and selling domain names. they sell the domain name and earn money from them

[nick_westlife]

I guess cheap domain are available because they have different extension from the most common extension like .com or .info or .net .They are private extension like .tv or .fv like that there are so many