(2) Starbucks business depends on having those measurements for quality control
(3) Starbucks gets lots of vendor deals from partner companies because they are a well know brand and having them on board helps land more deals
(4) Hacker using the machines might be able to sabotage the stories; food poisoning, fires, etc
(5) The smarter the tech in store — less training required per employee on site.
(6) Starbucks has other plans for it, such as enabling customers to use their network for IoT devices
(6) etc.