I don't really see how moving coins to yourself is good for the economy. In fact it seems like a waste of resources, though the benefit of certainly over lost coins might be worth it.
It's not. But keeping coins moving is. Any waste of resources in this instance is negligible. But I am more likely to spend coins if I am consciously aware of them as a resource, as would be required in order to move them. The good for the economy part is emission which compensates for lost coins. They will have higher velocity than average.