How does this calculator model a real group?
It models the case a group wallet is built for: many contributors pay into a shared pool, a few organizers spend from it, and every member gets a clean view of what was collected, what was spent, who spent it, and what remains. The default scenario is a 25-parent travel sports team where each family contributes $300 and five organizing moms run food, gifts, shirts, and end-of-season costs across the season.