why bother?
At $0.15 per GB per hour, by my calculations it's something like $110k/mo for a TB of space. For 50TB since that is their cut off your talking $5,529,600/mo for that kind of cash you can buy multiple 50TB arrays and put them at different sites and replicate them yourself and still save tons of money.
Anyone who pays for it I suppose deserves what they get.
Just another reason not to use the cloud (whether it's opsource or amazon)