At first, you have an influx of excited members, so it feels like you have a shot at it - but within a couple of years, most of them drop out. They either get discouraged, or they find their groove and really want the convenience and flexibility of working on their own schedule with their own tools that aren't abused by strangers.
If you want to run a Makerspace in Portland, Seattle, or in the SF Bay Area, you better have an endowment from a wealthy donor, a long-term government grant, or something of that sort.