ALSO: keep writing yours, because I want to read it! Don't stop considering publishing, either; even if there's no publisher on Earth willing to take it on (unlikely! I mean, that guy I mentioned got published!), you could always go the self-published route. At least among fen it really seems to be breaking out of the negative image it had -- Copperbadge has self-published three or four books now, and the author of an original slash novel I'm avidly following has said she will publish when the story is complete, and I've got money in a jar awaiting that day! You might not get rich or be invited to cons with David Weber, but I for one would gladly shelve your spacemarines!novel at the very top of my military SF shelf! :D