A new study indicates dropping out of high school doesn't just cost dropouts.  It costs society too, in real money.  The study of Illinois residents shows the average high school dropout receives 15-hundred dollars a year more from government than the dropout pays in taxes, because dropouts are more likely to get benefits, or be in prison.  The findings are based on Census data from 2009 and 2010, and point out the financial benefits of programs that persuade dropouts to get back into school, rather than becoming a drain on society.  The study was sponsored by the Chicago Urban League and several education groups.