I am a DBA PROUD TO SAY , Who are really critical for any small to big organisations to maintain their environments, speed up the process. Take care of the databases on day to day basis and also make sure that business can work as usual in case of any Di-aster recovery or failure of the DB's. Your knowledge cant be limited to only SQL Server database but can also do lot of development under SQL business intelligence tools like Analysis services, Reporting Services & Integration Services.  SQL is just a ocean and what we are working on it is just a droplet out of it the more you learn the more you need to know. But not all understand the meaning of a DBA some companies see DBA as only administer for database and don't give a opportunity to work on the development side which is the only drawback of being a DBA. If you know all DBA activities and also have developer skills, for sure HE/SHE will be the best developer as they know where they need to check in case of any performance issues. I as a DBA wrote lot of powershell scripts, stored procedures..