I'm not constrained by legal issues involved with making a living from my work... my stuff is in no way big enough to attract any sort of marketing.

I would argue rather that your work certainly could be. But you're not the sort to go around tooting your own horn, and it would require a fairly vigorous program of self-promotion. (For further insights just take a look at haikujaguar's "The Three Micahs" LJ posts) Hell, Howard Tayler supports his family with what he makes from Schlock Mercenary merchandise, and his artwork is like his main character, a pile of crap.