Although education at Dragon Academy is free, and every young dragon can attend the lectures by Ancient Dragons, room and board are not free.
The cost of accommodation varies according to the height and richness in resources of the Cloud Island, but even the most luxurious Dragon Nest isn't expensive. The real expense is food.
Of course, if one only wants to maintain basic survival and support the growth of their dragon body, the cost is not high. But if one desires food that is both delicious and nutritious, along with extra experiences, the cost becomes much higher.
Blue Crystal Grass is a relatively cost-effective food found by two young Silver Dragons. It contains spiritual energy and style, offering more than the basic meals available to ordinary Dragon Species.
As for the Grass Fruit produced by these Spirit Grasses, their price is tenfold, completely beyond the purchasing power of young dragons.
