Though Yahoo! Answers is point driven, with it's purpose is to allow us users to both submit questions to be answered and answer questions asked by other users. In other words, a community Q&A website. I'm a person who truly likes and wants to help others. At times I, too, am in need of an answer from a positive person who truly poses qualities answers rather than their absence. In both cases both parties will contribute to maintaining a mutually beneficial dynamic. And, that is favorable to me, helping others who help me, and that is what I desire to gain rather than high points.
(If picking one I would have to say respect. With respect being a two way street. Since respect means a feeling of admiring someone or something that is good, valuable and important. With like minded individuals, of course)!
Good Question :)