$45 million
The Army makes an approximately $7 million profit on Bingo.
Source: International Herald Tribune, 10/20/2005

Edwin S. Lowe
Lowe modeled the game after one in which players placed beans on cards and yelled "Beano" when they won. When Lowe tested his game, one player became so excited that she mistakenly yelled out "Bingo."
Source: Seattle Post Intelligencer, 7/1/2003