Because it's a tiny, infinitesimal part of their porfolio, a fraction of a percent, but one that has a many orders-of-magnitude potential gain. When dealing wi

Because it's a tiny, infinitesimal part of their porfolio, a fraction of a percent, but one that has a many orders-of-magnitude potential gain. When dealing with as much money as the OTPP has, you have to form a very broad risk profile: for every super-secure, government-guaranteed dollar, spend a fraction of a penny on a super-risky but absolutely humongous payoff.