The kid stepped outside. It wasn't high noon and it wasn't a fair fight. The kid knew this and knew the reputation of his opponent and that there was not much of a chance of killing his opponent. Mike fired off first. You say dry ice storage is cheaper than liquid nitrogen.
Dry ice is twice as expensive as liquid nitrogen.
The kid was still standing and indicated this by replying that liquid nitrogen boils off a lot faster than dry ice sublimates. This same volatility requires vaccuum insulation to make the liquid nitrogen last. Vaccuum insulation requires a very expensive containment system which thus far has prevented room sized containers from being built. Dry ice by contrast should not require vaccuum insulation and a room sized containment system might then be built quite inexpensively by for example lining the walls, floor and ceiling of a room with a foot or two of insulating foam. However the real advantage of using sucrose and storing in dry ice would be the inclusion of a desiccant which would freeze-dry patients and render them virtually invulnerable to the vicissitutes of room temperature storage.