First off, we really appreciate your contribution.
But sometimes users submit an article from somewhere else, not realizing that Wikinews cannot keep copy-and-paste versions of articles which are published elsewhere under a restrictive copyright. An article created in this way is a copyright violation, and Wikinews policy is to erase these even if they are excellent article ideas.
Another problem which sometimes comes up is press releases: Press releases are sometimes excellent sources, but they do not qualify as unbiased news articles so they can't be published as they are. Two key things to remember about press releases is that they're usually written to represent the viewpoint of an involved party (Thus likely running foul of our Neutral Point of View policy). And second, they are generally covered by copyright which can conflict with our open editing approach.
A better way to get an article on an exciting subject published here is to write an original article following the guidelines described in writing an article, or to write a brief explanation of the subject and include the url address of articles or websites to use as sources. If you are part of the story that the article is about, you may also wish to consider requesting an interview rather than writing the article yourself.