According to the National Assembly Budget Office, the volume of money that is illegally gambled in South Korea is estimated to be $67.3 Billion (75 Trillion South Korean Won).
The volume of wages placed in illegal gambling operations in South Korea increased by 41 percent since 2008.
The legitimate size of the gambling industry in the country is $15.2 Billion, or roughly 22 percent the size of the illegal gambling industry.
Source: “Illegal Gambling Industry in Excess of 75 Tril. Won…NA Budget Office,” Korea IT Times, May 22, 2013.