Every Exhibition Council organized pursuant to this Act shall have a board of 6 commissioners, to be appointed by the presiding officer of the county board with the advice and consent of the county board, or by the mayor, with the approval of the city council. One of such commissioners shall serve for one year, one for 2 years, one for 3 years, one for 4 years, one for 5 years and one for 6 years, and until their successors, respectively, are appointed and qualified. Upon the expiration of the term of each of such commissioners his successor shall be appointed in like manner for a term of 6 years and until his successor is appointed and qualified. Each commissioner shall be a legal voter of the city or county where the Council is organized, and before entering upon the duties of his office shall take and subscribe an oath to support the constitution of the United States and the constitution of the State of Illinois and to faithfully discharge his duties as commissioner. Each commissioner before entering upon the duties of his office shall also execute a bond, with security to be approved by the circuit court in the county where the Council is located, in the penal sum of $30,000 payable to the Council conditioned for the faithful performance of his duties as such commissioner. The commissioners shall serve without compensation.