EG lottery profits go to support additional money for public schools.
This is all after a 16% operating / administrative cost, of course, which amounted to ~$4.83b in California alone in 2012 (2).
Back in 1988 an article appeared in the NYTimes suggesting that what was actually happening with the money, only 3 years in, was that state budgetary offices were simply using this newfound windfall to supplant existing commitments.
Explained by the State Superintend at the time "the percentage of the state budget spent on public schools declined from 39 percent four years ago to 37.5 percent last year. Lottery dollars, he said, have in effect been used to make up the difference."
Part of my frustration with California's recent retroactive tax-raises, ostensibly for education, is borne out of examples like these.
(1) http://www.nytimes.com/1988/10/04/us/california-educators-as...
(2) http://www.calwatchdog.com/2012/09/27/ca-lottery-states-cash...