In order to carry out its purpose under this chapter of making loans to municipalities by purchase of the municipal bonds of those municipalities and by receipt of its income from service charges and from payments of interest on the maturing principal of municipal bonds purchased and held by it, and in order to produce revenues or income to the bond bank authority sufficient at all times to meet its costs and expenses of operation under this chapter and to pay the principal of and interest on its outstanding bonds and notes when due, the bond bank authority must at all times, and to the greatest extent possible, plan to issue its bonds and notes and lend money to political subdivisions so that the purpose is achieved without in any way jeopardizing any rights of the holders of bonds or notes of the bond bank authority or affecting other matters under this chapter.