Sam's Grill has been around in one form or another since 1867. It's one of a handful of businesses remaining from the Gold Rush era. There's also Tadich's Grill, The Mechanics' Institute, and, of course, Levi Strauss.
A few years ago Sam's was set to close and a group of customers banded together to buy the business. According to the San Francisco Chronicle, they remain anonymous. Since then there have been management changes and even a lease to renegotiate, but Sam's endures.
Stories like this keep turning up. Borderlands Books on Valencia Street was set to close when customers and neighborhood folks showed up with cash and expertise to keep it open. At the time this was referred to as "the public radio model."
We may be witnessing a merger of the non-profit and the for-profit. Sometimes, it seems, we don't believe in survival of the fittest. Maybe we don't want to live in a world populated entirely by the fittest.