Yup...The deeper the pockets, the better advantages you have when it comes to investing and self diversifying. Consider how the insurance companies are able to offer what they do (for investment purposes), and to who that benefits the most. The most affluent won't even consider management fee mutual funds other than a small portion. Instead they'll do what insurance companies do.. which isn't buying other company annuities or WL. The further down the line you are, the more these things become attractive.
You could do it yourself if you have the knowledge, discipline, and dough.
Most people don't.