I'm thinking about why some communities don't have the down vote option nor "close" or put "on hold" the content created by the user.
Just having an up vote option, or "like" for that matter, would be enough to give more exposition to good content, and its creators, while having a down vote option and the possibility of closing ones question just scares the heck out of most newcomers.
It seems to me that having a voting system with just a "like" option, and leaving all questions open while they are not spam, or have questionable behavior, would leave at the end of the day the same amoung of good content and users with good clarifications, but most importantly it would be more friendly to newcomers and current members.