This analysis entirely omits the cost of a sysadmin to manage the storage servers. Even if sia is assumed to do almost everything, and even if we only want 95%

This analysis entirely omits the cost of a sysadmin to manage the storage servers. Even if sia is assumed to do almost everything, and even if we only want 95% uptime, you still need someone to deal with software updates, hard drive monitoring, etc etc. The profit of $570/year/box is not enough to pay a part-time sysadmin and still have any useful profit.