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In all honesty, if they can manage it, your Carry should be solo laning anyways. The benefits to them in both XP and Gold makes them scale far faster than they would with a lane mate...
In Pub games though this is most of the time not gonna happen, so ya if I'm playing Ashe in the Center Lane and someone comes up there with me, you better believe I'm gonna snake every kill I can. They're already nerfing my XP/Gold just by being there, I might as well get what I can out of it.