So, I'm kinda confused about what your preference actually is. It actually sounds as if you're not for crossposting at all.
And I should say this is probably fandom specific - in CSI everyone crossposts to at least 3 different comms since there are many comms for character/pairings - and no one really gets annoyed about it because most authors do that, and so I do likewise. If it were HP fic, though, I'd probably only post to my own LJ and perhaps one comm, if it's applicable. So this kinda thing can't be generalized across fandoms, it really depends on the norm is in that particular fandom you're talking about.
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And I should say this is probably fandom specific - in CSI everyone crossposts to at least 3 different comms since there are many comms for character/pairings - and no one really gets annoyed about it because most authors do that, and so I do likewise. If it were HP fic, though, I'd probably only post to my own LJ and perhaps one comm, if it's applicable. So this kinda thing can't be generalized across fandoms, it really depends on the norm is in that particular fandom you're talking about.