Members do barter between each other, and members sometimes organize micro-credits between each other the central structure takes no percentage from those transactions. We encourage them to happen even if they are a bit more work with no moneraty compensation to the central structure. Whatever makes projects and cooperators thrive in the coop the management will very likely support it. It makes the whole ecossystem healtier and gives more reasons for people to want to be a contributing part of it.
We take 5% from goods and services sold through the cooperative to the outside world and that's what mantains the whole central structure.