People shouldn't get this wrong on the use of karma, there is no need for one to give karma to a user who is not active, the reason for giving anyone karma is because you feels that they have made a quality post on a discussion and you wish to express your heart felt towards that, the user will not even know who gives him, except on the situation whereby someone already made a quality post in the past and was inactive for a while, then you come across such post to give karma.