The Globe and Mail: Family movies outselling R-rated fare: "LAS VEGAS -- Family crowds spoke louder than fans of racy stories or shoot-'em-up action flicks last year at U.S. movie theatres, with PG-rated films hauling in more money than those rated R in the United States (equivalent to 18A in most Canadian jurisdictions) for the first time in 20 years."
And this is in a year that included the most successful R rated film of all time: The Passion of the Christ
Dennis Prager has said for years that the reason Hollywood doesn't make more family films is not economic; clearly the money is there. It's that hollywood generally is not populated by families. R rated fare better reflects the demographic of hollywood.