I think that with any writing you really have to be in it for love, rather than as a quick way to fame and fortune. My old man quit respectable employment to be a fulltime writer when I was a young kid, and while successful it didn't make him a plutocrat. My own efforts have brought in the odd payment, but I wouldn't want to depend on it for my income.
I hope your pocket reference sells, and you enjoy writing more to follow it.
