If someone buys a big EMC system, they aren't just paying for hardware and software. They're paying for EMC to also integrate it into their other systems, set it up, train them to manage it, provide custom coding if their environment requires some unusual change, give early access to fixes for problems they experience, etc. There's a support contract with SLA. There's free overnight shipping of components, and field techs that'll fix the hardware for the customer.

Can someone else do it for cheaper? Maybe. Probably. But to a large degree, it's a "no one ever got fired for buying IBM" situation that you'd be fighting against.