I read the discussion following the question:
I see the point of Jim (even if I think that Robert Cartaino is also right).
But, what if the questions were proposed in reverse order meaning that each point attributed to a question will "weight" it and get it a bit lower in the list (negative number will drag it all down at the end of the list). The question with no point will be displayed first, then with one point and so on.
With this way, people will be forced to browse the list of questions and select really their favorite questions with a higher probability for lower scored questions (at least, this is what I expect).
I am sure that this way has also drawbacks, but it may help to solve the initial problem.
Another problem, for which I have absolutely no solution, is that most of the people won't vote at all. They will only follow a proposal and quit. Apart from educating them, I don't know what to do.