Nobody said it's a 'lease to own' situation with the system. Never mind that it includes computing time and server-side calculations and database access so chances are it is a system that is simply being 'leased' to the police at the cost of 25% added value to all transactions made possible through it.
Plus, for how long +25%? For the time it paid off the system or perpetually? Is there a price on other "commercial" usage of collected data?