It's actually cheaper when you want global redundant storage. Cloud providers often charge twice as much for global redundant data. RAID 2,3,4 offer global redundancy, but only take up 1.5 times us much space. Instead of paying twice as much you only end up paying 1.5 times as much because you can get away with locally redundant pricing. If you're large enough you'll actually save money by having more negotiating power since you can walk away from a provider at any given time.