Answer:
Because spice is super valuable. It adds more flavour to their native dishes so it's super important. And it also slows down the decaying of food.
The main reason why they want to collect those sexy spice is that after the 1453 Fall of Constantinople, the Ottoman Empire (victors of the 1453 siege) banned Europe from spice trade which forced Spain and Portugal to explore and show Europe the world.
Explanation:
