I think to "make a living" online you have to be offering more than just your opinions. Very rarely, a blog will get such an audience that advertising revenue will pay for a decent living, but it's like dreaming of being a rock star: Only one in a million will make it.
If you're offering tech support, design/layout, or anything of substance other than just a blog full of commentary and such, I think it's very possible to "make it" online. You're in a good position to do that, Aaron. I blog just for fun never expecting to make anything of it other than a few bragging rights if I gain any sort of audience...