I volunteer at Noisebridge, a hackerspace in San Francisco. Anyone can walk in off the street and use our 3D printers, sewing machines and electronics lab. No dues are required. Newcomers sometimes ask how to become a member. I’ll tell them “You already are!” but what they’re really asking is how to formalize the relationship: give money, get access. They already have access. So the trick is getting people to pay for something they get for free.