Need to determine how to prevent users from getting around a rule-limiting AO implementation.
Possible solutions are:
Limit the number of rules instead. This has the benefit of being immune to people wiping their DB entries, but some users could be pretty happy with what they have.
Remove some actions from the free version. Not great, because it doesn't actually do any free-to-paid conversion (just splits the userbase).
Contact external license server. Development and maintenance burden, and unattractive to server users.