you know, many games use sale models where the base game gets discounted to such a low price it's basically symbolic, but the dlc:s remain expensive. they want to first hook you, and only then exploit you. iirc this is the case here. and dlc unlockers work well on steam. meaning, you can get the base game for pennies for all the steam features (workshop is especially worthwhile) but without paying intended price. for games like this, i actually do not recommend pirating, but rather purchasing a resold key for the base and then unlocking the rest. it's worth it.