It comes from all of the aforementioned. Certainly from outsourcing, as a SaaS platform that provides hosting, system administration, data back-up, security, and a Monday - Friday help desk saves on internal IT costs. It doesn’t need to shrink your IT team per se. It can free up your staff to work on more future oriented problems than providing support for antiquated hosting and CMS options. Consolidating onto one CMS also eliminates duplicates of effort within your IT team. Savings on custom website design can be a big part of it if a school is hiring a lot of outside design firms for creative work.