Nothing is more inspirational than a deadline. These websites update their competition/submissions information every month, so that YOU can choose one (or three) in any genre and GET IT DONE! Yes, there is usually a fee (sometimes quite hefty) but, without the pressure of that deadline, when else would you make the effort to rewrite, cut and polish a piece of work until it's as good as it can be? Trust me ~ the whoosh of pride and satisfaction you get when you press that 'Submit' button (two minutes before the official deadline, of course) makes you feel like a winner ~ every time.
However, it's always a good idea to read the rules GOOD LUCK!