They try to actually give you something you want. But they also hand out #18 on your list sometimes. If you don't like what they give you can deny it, and reapply later.Haha what's the point of ranking it. So if you don't accept the job offer will they send another one off the list or you just have to try again on another future bid?
Personally I don't think you should be able to since the first question you're asked when applying is "ARE YOU WILLING TO WORK ANY WHERE IN THE US?"
I get lists can suck and they can give you some place terrible, but you told them you'd work anywhere.