I chose to watch R-rated movies if it appealed to me, the story, the actors, the director. If not, I would rather go to a good PG movie than a badly made R movie.
Still holds true, if it's a movie that I care to spend my money I go.
Strangely enough, most movies I go to are usually PG-13 or less. Somehow movies that say f**k 15 times in 3 minutes or s**t, etc., don't appeal to me.