Since the ideas that have received more attention (more votes) appear first at the "ideas" page, they tend to keep first in list and continue there, preventing the bottom-most (and not necessarily worst) ideas to be seen by the casual or hurried or lazy visitor.

I think, at least from the front-end, that the users must see the ideas in a somewhat unbiased fashion, since only for the site admin the amound of votes would matter in the end (in order to prioritize implementation)