Paranomal Activity

My uncle posted this interesting news item on facebook which I want to pass along:
http://movies.yahoo.com/news/usmovies.accesshollywood.com/paranormal-activity-becomes-most-profitable-movie-ever

Paranomal Activity is now the most profitable movie ever made. The article reports that the movie was made for less than $15,000 and has grossed over $65.1 million.

What I found most interesting is that Paramount studios has spent "only" $10 million to market the movie. It is unsettling to think that $10 million in advertising is a drop in the bucket. I wonder how many movies I've seen soley because of the advertising?