Back in the 90s we had a surprising customer who paid tens of thousands of dollars a year for a subscription. They never reported any bugs but seemed happy -- our salesperson would check in on them ever few months and got an annual renewal without fail.

Eventually she left (to get an MBA) and the guy who took over her territory had trouble reaching the customer on the phone. Eventually he did get a meeting and when he visited discovered that all our packages (software and printed docs) were on a shelf in a cubicle, and that they were uninterested in renewing. It seems someone had the budget to spend and everybody liked having the saleswoman come visit. But they didn't care about a visit from Norm.

A rather extraordinary waste of money, but helped our bootstrapped company!