Say a millionaire decides to invest in Britain early in the war by purchasing a vast amount of war bonds, couldn't they expect quite a profit after a while?
Not the exact thing you are asking but the Shriners bought a large amount of War bonds during WW2, which with the returned money they in turn invested in charitable things such as hospitals.
http://www.alzafar.org/the_fraternity_flourishes http://www.shriners22.org/history/ http://news.google.com/newspapers?nid=1946&dat=19461021&id=7oU1AAAAIBAJ&sjid=9pgFAAAAIBAJ&pg=4195,3823070 Freemasons for Dummies 2005 edition.