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I think there is a fourth option:
#4 Because I have to.
Since I can remember (and earlier, judging by things my mother has told me) I have had stories in my head and I need to get them out. I write for my own sanity, to keep the stories and characters quiet, to give them life. I never felt it was a hobby because it was something I was compelled to do. The fact that I am now seeing some publishing success (and finally some decent paydays) is irrelevant. I still need to write. I write what I want to write. Around 75% of what I write will never be published, will never see the light of day, because - as you said - it "falls between two stools". Even if I had sold nothing, I would still write. I don't care. I write because that is what I need to do for my own sanity, my own peace of mind, myself.