I’m a bit slow to repost this, but I didn’t have a blog back in February. Joss Whedon discusses the business model behind Dr. Horrible.
In a nutshell, it cost $400,000 to make (including cast and writer’s fees, which were deferred) and has at least broken even. Some sites claim it has raked in $2.5m. All Joss says is that iTunes was “a great boon”.