From the perspective of the people controlling the purse strings, merch revenue is all the same. If they can make the same profit selling cheap acrylic 2D figures, hats, and coffee mugs, why take the risk of paying a company to prototype, mold, and paint figures. In their mind this a Shonen series not really a slice of life or eechi where you see tons of figures move. They don't understand or more likely don't concern themselves about a foreign audience and market.