It is still unclear why do we need membership at this site, but there are a few things that make this option possible:
1. Assuming that all members may participate in one or more projects and may need access for editing the content of this site or related groups on forum, etc., subscription for a membership may help to organize this interaction.
2. Organizing our regular meetings to maintain this work active and productive takes some sources and membership can potentially contribute to this.
3. Being organized in a membership it could be easy to allocate all payments on this site entirely to the maintenance of this project.
Any other thoughts? Lets think about it together!