The annual Comic-Con International kicks off this week in San Diego. Comic-Con makes money selling tickets, renting floor space to vendors and exhibitors, and getting sponsors. GuideStar, which tracks nonprofits, says the convention has seen steady year-over-year revenue growth for the last 17 years, as comic culture has become central to pop culture. The most recent report puts convention revenue at $19 million, which exceeds its expenses. The convention brings tourism dollars to San Diego and has spun off other events in other places. 

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