Rubarb mouse!
I have a remote control for me TV. I don't need this
http://www.iwantoneofthose.com/ProductDetails.aspx?language=en-GB&product=KAMREM&category=elec but I still want it. There is no necessity involved.
I'm currently learning the TopRock (easiest breakdancing move in the whole world). You can't tell me there is any necessity there! That's about the most illogical thing in the world. Can't imagine any AI processing it's pathfinding algorithms and coming to the conclusion it's going to learn how to toprock.
I think want = desire. Desire is an emotion. You can break down every emotion into components that aren't emotions. For example, you could say "happiness" is not an emotion - it's simply a state of well-being - knowing that everything is satisfactory in your life and there are no problems to solve. But on an abstract level, happiness is an emotion, as is sadness, as is jealousy, as is desire and want is exactly the same as desire.
Need and want, however, are totally different. If simple AI will go and do something because it needs to do it, then fair enough. Simple AI wont go and do something on a whim because it kinda seems like a good idea, but there's no logic behind it. That's want.
Insiiiiiiiiiiiiiiiiiiiiiiiide!