I've never made money from my personal work. I've been employed as a photographer by newspapers, public relations departments and commercial studios, and those were the only times I've made a living with a camera. I'm a poor self-promoter and have no idea about marketing strategies and gallery games.
These days I help pay for my photography by making an occasional portrait and teaching film scanning for a local photography non-profit. I may be leading some other workshops or field trips in the not-so-distant future.
I look at my personal work the same way I look at owning a boat: I'll invest time and money in it and derive what pleasure I can from it. I don't expect a return on my investment beyond that.