Spirits are not exactly sentient, nor are they simply geological forces. There is a degree of competitiveness between spirits over territory - but they are not doing this with conscious moves for wealth or power. This is the closest thing to a biological drive a metaphysical force can have. The nearest analogy would be fungal networks. While many of these networks can span miles, you'll only ever see them in fruiting bodies above the surface. Swap out the network with the spirit and the mushroom with something like storms - and you have an overview.