I have one: I self-publish science fiction on the side. Although it isn't consistently $500 per month yet. Sometimes it is a bit more, other times less. The income goes up as I build up my backlist, but usually it is a spurt in the month of release that then trickles down to a lower baseline. With each new release, that baseline gets a little higher.
I don't feel like a good enough writer to share my pseudonym yet. It isn't a huge secret, but not something I actively link to. Maybe when I reach some kind of minimum personal threshold of success I'll be more open with my writing.
