Creativity, or lack there of, in mainstream movies.

Think back to all of the so called "chick flick" love stories you have watched throughout your life.  Notice how many (not all) have very similar story lines.  They meet, not expecting to fall in love, fall in love, there is a misunderstanding or some kind of conflict, then they make up in the end.  I have seen this happen in movie after movie.  For example- How to lose a guy in 10 days, She's all that, Failure to Launch, and 10 things I hate about you.  This happens over and over in Blockbuster hits, but people seem to never get sick of it.  One would view movie making as an art form and highly creative, but because the movie industry is based on revenue, movie makers have to give their audience what they want.  I do think that some blockbuster hits are successful because of their creative aspects, because it is something new and exciting, but more often we see the same pattern of plot lines over and over.