I think the concern I would have if I was intending to submit a story is that if I wrote a story now, then when I had sufficiently fine tuned my writing I extended or polished it, I wouldn't be able to get it published because it'd be on here.

And it's all well and good to say it's more work for you, but keep in mind that the members are here for you to look after and help out. If the attitude is that you can't be bothered hearing them out, or taking on board what they think then that's the attitude you'll get back. Best of luck with the contest, I remember the last one was a real cracker