Now, I'll admit, I'm a big fan of open calls, as two of my three published credits came from open calls, one from Sword & Sorcery Studios and DragonWing Games (actually, it was Bastion Press, before it's IP was moved to DWG), and I feel that they give the fan, as well as semi-profession and even professional writers, a chance to make a break into the role-playing game industry and follow their passion. Wizards of the Coast even did an open call, with their setting search a few years ago, which gave us Keith Baker and his setting of Eberron, a setting that I enjoy, a lot.
Not only is it an opportunity for the winner of open calls, when they are in a contest form, but there is opportunity for those who participate, if they catch the right person's eye during the contest. It is an excellent way to make a good impression on people in the industry, as they will attach your name to good work, or if you do it badly, well, then there is that bad impression, but the risk is well worth the reward.
So, I wish those of you who look into this open call, or other open calls, all the luck in the world, however I cannot, in good faith, wish that you win, since odds are I'm competing against you. Enjoy yourself, though, and see you on the other side.