Given that a kilogram of anti-matter could be used to make a 50 megaton bomb (or lots of little bombs), I have some uses.
Storage is one step
Economical production is another.
Apparently, they have confirmed that there are millions of tons of this stuff trapped in the magnetic belt around Earth.
Reminds me of the Californium Bomb project. One ton TNT equivalent out of a grenade launcher.
Seriously, it may take 100 years, but antimatter will make great starship fuel. It can also be used to catalyze hydrogen fusion for spaceships IIRC.