Casper will solve the problem of high cost of data storage on the block-chain and provide developers DApps is a decentralized file storage with a competitive price and speed, which is controlled through smart contracts.
Yes you are right with that but not only the cost but also the security and efficiency of the data storage where Casper Team only can provide both of that a data storage with impenetrable security, faster and more reliable data storage only here in Casper API. Their ideas of team are really amazing that's the one big reason why I started to support this ICO because for sure in the near future it will really huge.