[jmacd]

Retrospectively, this is very similar to how most SaaS behaved when per user per month billing was first introduced. There were almost never any actual limits on the number of users you could add to the software, but you purchased a license for a certain number. Occasionally your account would be audited and you would be billed of the overage. It was always a significant penalty. The same was true for CPU based licenses for things like IIS, SQL Service, Oracle, etc.