If anybody has the magic formula for pricing, I'd be all ears. Yeah, $100 a year seems steep - but OTOH are twice as many people going to subscribe for $50? Five times as many for $20? (Or more...)

I don't know what the answer / formula is, but I pay more than that per year for my LWN.net subscription and for a few other publications. Less than that for others, but I really don't know what the "right" level would be to maximize revenue so they're able to pay themselves a decent salary and keep the lights on.