even if arrows were limited i'd use another unit for fodder. as goblins are weak to archery.
all in all i find goblins completely useless. thought i find most of the orc troops inferior to the other races in term of counterpart. thought i dont mind that i just wish they increased the orc troops numbers. so instead of slayer being 24/24 it would be 30/30 ect. to balance out damage and hp that way.