The [Wagering in Illinois] report says adding casinos in Chicago, Rockford and four other locales, adding three racetrack casinos and adding more gaming positions at existing casinos would increase overall revenues by $1 billion, but would increase tax revenues by about $75 million because the "expansion would coincide with a reduced tax structure." "The state could have a large expansion of gambling, but yet have little new tax revenues to show for it," the report said.