I'm not sure what your popularity metric is, but here at GitHub we're making plenty of money on subscriptions for private code hosting without a single advertis

I'm not sure what your popularity metric is, but here at GitHub we're making plenty of money on subscriptions for private code hosting without a single advertisement on the site. We've also never taken any outside money. GitHub was designed from the very first line of code to make money off of recurring fees for premium features while bringing in traffic, goodwill, and buzz by making everything free for open source. So far so good!