There is always a chance, though rather small, to get an Aetherpool increase on your items(I was able to get an increase on some of the lower floors when mine was 80+, but it was VERY rare). Aside from using it to get the Kinna weapons, you only need it to be able to make going to floor 200 easier(so I've been told, I've never done the floors past 100, so not sure how they are).