Regarding sales figures comparisons, there's also the matter of price disparity.
Video games make BILLIONS far more frequently than films.
GTA V crossed the $1 billion in just 3 days. Granted, that was a record, but compared to films, Avatar, HP and the Deathly Hollows pt 2, and The Avengers all hit the $1 billion mark in 19 days; Arguably, The Avengers is a bit more impressive as it had only been in North American Markets for 10 days at that point, where as the former two films both opened in NA markets the same week as they did internationally.
On that note, outside of Disney (which has had 5 films hit the big B mark,) no film studio has had more than 2 pictures hit that mark.
I can't seem to find any indication on how many billion dollar games the different game companies each have, though I imagine it's a tad bit more common.
Looking at world wide sales, video game sales dwarf films. In some countries, videos games generate more than DOUBLE what films are pulling in WORLD WIDE.
Point of clarification, I'm not sure if those numbers are referring to just total sales, or total profits, which means the comparisons could be a bit off, though video games still dwarf film in terms of money generated in sales.