The purpose of ORS § 732.517 to 732.546 is that of regulating the control or ownership of an insurer or of an insurance holding company system. A further purpose of ORS § 732.517 to 732.546 is that of promoting the public interest and the interests of policyholders and shareholders by facilitating, consistent with those interests, better use of management skills and services, diversification through acquisitions, free access to capital markets, sound tax planning and open competition. [1983 c.498 § 5; 1993 c.447 § 25]