There are several ways to monetize domains on the Internet. One of them probably everyone will know who is selling them, but there are other ways to earn money with domains on the Internet. One of the techniques used on the Internet, is the Domain Parking. what’s Domain Parking? It consists of being the owner of the domain (eg.: www.domain.com), and put the same domain parked.
And how will I make money with this? Simple.

Parked Domains

There are many companies of Domain Parking, where we can sell our domains or simply parking them. When an domain is parked in an enterprise of this kind, will be used a certain advertising, with which we will make money on every click made there. Basically all visitors to the domain who click on ads, will monetize our domain.

Google also has a system of Adwords to put on parked domains where the customers can have a return. There are also those who buy domains specifically for parking and make money.
I will leave you a document from Wikipedia to see if you need more information: http://en.wikipedia.org/wiki/Domain_parking
You can also consult the following addresses for more information:

http://www.namedrive.com/
http://www.sedo.com
http://www.google.com/domainpark/

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