I've been a bit snotty on the donations-for-content front in the past. Sure I contribute to public TV and Wikipedia.  But I guess my gut said, if your content is good enough, why not man-up and require payment to access it? Subscription Site Insider's new Case Study on blogger Ira Stoll's business Model changed my mind. Stoll has a mission beyond simply making a living by publishing something online. He focuses on a beat that he cares so passionately about that it's painful for him to imagine sl...