Why the movies which are postponed in releasing do have a low success rate at the box office?

There are several movies which the schedules are over and the producers announce a release date but they will get postponed by a week or more than that due to various reasons like lapse in technical aspects and other things or the distributors lack the interest in buying the movie or financial troubles in releasing the movie or If it is a star hero the fans disappoint for the postponed of the release date hence they lost the interest in the movie.Can you list some movie names which are postponed by week or more than a week but they are hit at box offices? Knowledgeable members please respond to the question.