spice density reduced to match RA's

Spice contains 25 value per unit, like in RA, instead of 50. It seems more suitable for map-makers, who will rely on their intuition of ore distribution from making RA maps. It's also fitting with having vast expanses of sand with lots of spice spread out on them. You don't want the vast expanses of spice to be too dense, or there will be too much money on your map.