Honestly, $600k/month for 300 knowledge workers is horrible revenue if growth and margin aren't on the right track. This is more like a "20-30 pretty decent consultants in a second-tier American city" number.
Yeah I don't disagree that it's not nearly enough for 300 workers. I just think that they totally have a legitimate business model to make Real Money. And my whole calculus was based on just the first thousand patrons, but I think there's a very long tail here.
Wait, how does $50M not cover 300 employees? Is fully loaded cost of employees (I imagine most of those 300 are _not_ super high level engineers, but things like CS and admin) in SF really above $160k/employee?