Currently my seals take up 45 inventory slots. Why don't they ever think about this kind of issue? Most people are not going to throw their seals out...most keep them and say "hey maybe I'll use it someday or maybe they'll let us trade them.
If I complete a piece I'll buy it trade the seals and store the armor. But the seals I don't actively go for tend to pile up...Or sometimes I still keep the seal set because I like to think they'll let us trade them(to players or npc for something you actually want)