Insurance agents, financial planners and even accountants sold many of these plans. The main motivations for buying into one were large tax deductions. The motivation for the sellers of the plans was the very large life insurance premiums generated. These plans, which were vetted by the insurance companies, put lots of insurance on the books. Some of these plans continue to be sold, even after IRS disallowances and lawsuits against insurance agents, plan promoters and insurance companies.
As the IRS started going after 419 and 412i plans people started selling captive insurance and section 79 plans.
The primary use of a captive must be for bona fide risk management purposes, and not to save taxes. Unfortunately, many of the same promoters of tax shelters who a few years ago were selling Son of Boss, CARDS, BLIPS, and other flavor-of-the-day tax shelters, are now selling captives as a way to save taxes, with only the barest lip-service being paid to the risk management function.