Big-budget movies often gross two or three times the cost of their production and marketing.
Given that ...
Big-budget movies often gross two or three times the cost of making and promoting them.
How is it that ...
Most of movie industry's total revenue comes from low-budget movies?
Evaluate
Maybe there just aren't that many big-budget movies. Even if each one profits $20 million, if there are only 20 of those but 2000 low-budget movies, you could still see most of the industry's total revenue come from smaller-budget films.
Maybe the profit margin on low-budget films is four or five times the cost to make and promote them.
Goal
We basically want an answer to point out something that makes big-budget movies not that lucrative for the movie industry overall, or something that makes low-budget movies good money makers.