Ask HN: Are hackerspaces viable businesses?

I've been in and out of involvement with hackerspaces for 5 years now. It seems like hackerspaces still have not reached any sort sustained viability yet. Most need to operate as non-profit organizations that are barely hanging on. Even Techshop and other large makerspaces seem to be doing an awful lot of work for a hardly self-sustaining amount of revenue.

Is there a killer business model that hackerspaces are missing out on? Recruitment and training for businesses? Providing or referring services that are useful to entrepreneurs?

What can make this sort of space a growing business rather than one that builds a little, then just fades over time.