One of the largest costs involved in running the workspace is likely to be paying for services to keep the place operating. Relying on one or two people to volunteer substantial time to get the place going may work for a while, but that is not a sustainable business model and could see the place face problems if those people cannot continue.
My thought is that we should offer the ability to provide as many services as possible to members. For example, keeping the internet connection running and making sure members can log-in will be an important task. Hopefully we will have an IT expert amongst the membership who can do that for us in exchange for a greatly reduced monthly fee, if not a free desk.
I have added a section to the business model to take this into account. It allows us to estimate the hours involved with each service and apply an hourly rate, and then see how this affects the bottom line.
My assumption is that the rate that will apply to internal service providers will be lower than market, but more than just a nominal amount... meaning there will be an element of giving involved by those who take on these roles... but that's what coworking is about, isn't it?