I've been entering my local shows...
because it does seem to make me concentrate on finishing the project. It also does help the local arts association that runs two shows annually.
I've also been submitting work lately to keep silver based processes in the competition. It seems I'm the only throw-back shooting film in the past three shows to which I've submitted work. I make it a point to sling a camera over the shoulder when attending the reception & awards ceremony.
If you're considering giving it a try, I'd encourage you to do so. Just keep in mind that whomever is judging should not sway your own opinion as to the quality of your work. It took me a few shows to get the attitude that the process is sooo subjective it shouldn't affect your own visions and goals.