I think you're missing out on a few of the big SaaS players here and then some of the smaller ones you never see if you're not in that dept. Most companies will have some CRM (salesforce, dynamics...), an ERP system (Workday, NetSuite...) and some marketing system (Hubspot, Marketo...) each of those will cost you a few thousand. Then there are the smaller tools, HR / Recruiting, T&E, team planning (monday, pivotal...) and finally Email/Calendar - just look at what GSuite costs. All of those costs add up quickly for the rank and file employees.