White-paper on permanent-life-insurance. From PLW (an investment advisor firm):

Life insurance is a financial contract that pays out when the life of the insured ends. This paper is designed to give an overview of life insurance as a concept, including an analysis of life insurance as an investment. We observe anecdotally and empirically that some types of life insurance are sold more as investments than as risk transfer contracts. We call this practice into question through analysis of after-tax returns for traditional investments and life insurance. We suggest that the motivations to sell insurance as an investment are, in many cases, related to conflicts of interest.