Because when using commodity hardware, strength is in numbers. Very few organizations need the computing power of Google, FB or Amazon, so they can't benefit fr

Because when using commodity hardware, strength is in numbers. Very few organizations need the computing power of Google, FB or Amazon, so they can't benefit from the "reliability at scale" that those companies can. Therefore, they need to buy enterprise-grade HW which fails far less often, even if disproportionately more expensive.