That's an interesting question, and one I admit I've never given much thought. I write in Canadian English, which is a bizarre hybrid that follows US conventions in some cases, UK conventions in others, and in some cases lets you use whichever of the two strikes your fancy. And I submit in Canadian English, too, even though my subs are probably weighted more toward US than Canadian outlets simply because of their higher numbers (Canada has approximately the same population as California).
So far it's never been an issue. Part of this, I think, is because there isn't a standard English on the internet, so people are more used to encountering different dialectical conventions than they may have been thirty years ago. But I would also expect a journal's standards to be enforced far more strictly for prose than for poetry -- where readers are already primed to expect a looser approach to language, punctuation, structure, etc. anyway.
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