Every organization sees security as an area where you can never have too much, but the cost of securing the network is effectively money lost. The constant evolution of the threats means that both developers and end users must make major investments to keep pace. Custom hardware is costly to develop in terms of volumes of production, non recurring engineering costs, and most importantly time. The humble PC server has seen exponential growth in performance and capability in recent years. Multi-CPU and multi-core processors and new bus technologies allow for data processing at rates previously impossible.
Source: https://www.helpnetsecurity.com/2006/12/21/wheres-the-roi-on-security-hardware/