Many people do this for a living.See Domaining.com and DNJournal.com for news about this.See Sedo.com and Afternic.com. They are the two many sales platforms for selling domain names.See DNForum.com and NamePros.com for advice (they re both forums).
Sure you can sell domain names or sites.If your domain name is having a keyword then its more worth for selling.You can go to sites like flippa, digitalpoint forums etx.
