Interesting formulation of the group payment problem (we are a group of people, and we want to keep track of our payments). Nice constrast to for example Event

Interesting formulation of the group payment problem (we are a group of people, and we want to keep track of our payments). Nice constrast to for example Eventbrite (I want to sell tickets to an event) or SimpleSignup(I want people to be able to sign up to my event(s)).