Grinols' studies also show that between 37 and 50 percent of casino revenues come from pathological or problem gamblers.
THE ASSOCIATED PRESS/Maine's neighbors would copy casinos /11.10.02
Gambling in America, Costs and Benefits by Earl L. Grinols

A new study, funded by the province, measured the spending habits of problem gamblers in Ontario. It found that 35 per cent of money raised through gambling – $1.4 billion – comes from problem gamblers,
CBC/Ontario wins 35% of gambling cash from problem gamblers/11.2.04

Mr. McGuinty's comments came in response to a new study that suggests about 36 per cent of Ontario gaming revenue is generated by people with gambling addictions. The study by researchers Rob Williams and Rob Wood at the University of Lethbridge in Alberta...
The Ottawa Citizen/Ontario addicted to gambling revenue/11.03.04