Well, there are also data integrity issues to take into account... in the simplest terms, you'd actually need 3x the available storage to "guarantee" that there won't be any bit nor data loss if a single drive (our of three) - does... Add a potential (mandatory?) off-site backup, means of restoring it, and... Not even getting into the bandwidth cost can of worms.
Again, this is in very simple (and low-scale) terms.
It seems very presumptuous to assume there is no market for people who don't need all of those things. I can back up and restore my own data. Might take a while, but that should be my choice. Nor does it explain why web services like Google Drive is 1/10th the cost per TB of the same volume size on a cloud server.
Again, this is in very simple (and low-scale) terms.