Users with less than 15 reputation make up about 40% of users on SO. Users with less than 15 rep cannot vote at all, even on their own questions and thus can only reward a single answerer - by accepting an answer - even on their own questions. I propose that all users be able to vote on their own questions. We've already seen one case where a user explicitly avoided questions by users with low reputation. This would help solve this problem by allowing even new users to acknowledge helpful answers by awarding reputation to all that are helpful.
If a person asks a question with 3 upvotes they will be able to vote on the answers to their questions. If a person asks a question that does not receive upvotes, I'm not sure how important it is for them to be able to upvote. Additionally, it might make it easier to setup shell accounts to gain rep.