Your ownership of a unit in a scheme immediately makes you a member of the body corporate. A sectional title scheme is a democracy where no one person or small grouping has the power to take minority decisions. There are a number of mechanisms to protect the rights of individual owners.
One such mechanism is the annual general meeting (AGM) where a number of prescribed things happen. Among others, the audited financial statements are tabled, as well as the budget for the ensuing financial year. The term of office of the existing trustees terminates and new trustees are elected. It just makes good sense to take the time and trouble to attend the AGM and influence the affairs of the scheme, of which your unit forms a part.
The body corporate (consisting of all owners) controls, manages and administers a sectional title scheme. The trustees that are holding office are the managers - subject to the Sectional Title Act, the Rules and any restriction imposed and/or any direction given by the owners. They are, as the Paddocks - Sectional Title Survival Manual puts it, the servants of the body corporate, not its masters.
Refer to part VIII of the Sectional Title Act for more information. [Revised 17 May 2010]