Why do credits expire?
When you give us money in exchange for credits we promise to give you products and services for the equivalent amount in return. In terms of book keeping your credits denote a debt. When we calculate the financial situation of Navigraph we balance income against debts: used credits against unused credits. If the debts build up we will have a negative result. Some users only use say 95 of their 100 credits. If many users leave 5 credits on their account without noticing us when they intend to spend the remaining 5 credits this will eventually build up our debt. Assuming an infinite number of users this means an infinite debt. For this reason we need a mechanism to identify users that do not intend to return and spend their credits. This mechanism revokes the remaining credits to reflect the users intent – namely not to claim the remaining dept. If credits did not expire we would suffer from an unjust negative result which would hinder our possibilities to evolve. It would also force us
