I've rarely made a living solely from my landscape and macro photography, which is indeed my passion. I sold every print at one show I had years ago, while still in college, and it netted me enough cash to by a (very) used car for $500. The very next show, two months later, I sold nothing. In a good year I might sell a dozen prints, in a bad year, zero. The most "profitable" photography I've done has been portraiture and wedding work, which I don't do often. I've done other random things like individual lessons, minor camera repairs, or product photos... Definitely a hard way to make ends meet, but I keep trying!