I worked for a vendor that charged $$$$$$$$$. The software itself was often not the biggest cost component, it was what it cost to get it working in accordance

I worked for a vendor that charged $$$$$$$$$. The software itself was often not the biggest cost component, it was what it cost to get it working in accordance with federal/state/local labor laws, any relevant union contracts, and company policy. It was a complicated software package that did nothing out of the box and everything required significant configuration of the rule engine to account for the customer’s needs. It shipped with some building blocks for the rule engine but often/always required custom code to facilitate things the customer needed. My job was to fly out to customer sites and perform the custom implementation tasks.