I have many interesting conversations with non tech people about storage costs, "I can go to PC World and buy a 1TB disk for £30 why dou you charge me £4200 pper year?"
Good question. Weel there is teh primary storage, that cost £1500, then there is backups, that is £600, then there is the DR and the offsite copy of teh backups which doubles it.
"But why does it cost £1500 for 1TB of primary?"
Ah, software and all teh controllers and stuff to move all the bits around......Software to manage it......
Cost per GB of individual disks is quite different, but no one buying storage buys a disk, they buy a storage system and the cost of flash become a small componetnt of the overall cost. Software, replication funtionality, support costs etc all make the small difference in cost of SSD around 10-20% of teh total, which tips the balance in favour of SSD given it responsivenes and generally speed improvements.
Storage is due another disruptor, Nutanix is trying its hardest and Pure, Tintri and Viloin (amongst others) have all had go with varying degrees of success and impending doom, but it is all been different form factors which the big boys don't feel comfortable with and dont work for every scenario (unstructured data anyone?). Ultimately it needs something to break the monopoly of the big boys (EMC, HP, IBM, Netapp, Hitachi) with their "value added/should be standard" extras which may actually see spinning disk regain ground on a cost basis as other components are comoditised included as standard, but no one has really gone after them in their own space with a proper purpose built SSD based system against their stick some SSDs in an old Clariion mentallity.