My grandma used to work at a one of those frozen concentrate plants, Everytime we visited her we would leave with a bunch of frozen grape juice and oj concentrate.
Funny thing is, i haven't had these since i was little. Don't see the point anymore, its like $4, but you buy a full gallon of juice already made for cheaper.
i guess if storage is an issue its handy in the sense that you could store a ton of these in your freezer without taking up much space. Whereas it would be much harder to find room 10 gallons of already made OJ. But i can just go to the store and buy more if i run out.