It's taken as a given that comics don't make money. Obviously the direct market has its share of difficulties - between monopolized distribution and a high barrier to entry for potential readers - but even online comics are regarded as financial sinkholes. Despite that, more and more creators seem to be able to make a living making comics. They're leveraging crowdfunding, consistency in publishing, and their own creativity to claw (yes I went for the extra alliteration here) their way toward financial independence.
If comics could just sell more copies, though (both within the direct market and outside of it), a lot of these problems would be fixed.
But it's hard to sell comics, right? People just don't read comics.