Actually the reason NPC groups don't do it is because we have a rule against it. The rule was instituted because groups were stealing members from other groups. NPC doesn't happen to have a reciprocal rule with any others. Should we? That's not up to me but it evidently isn't a priority for NPHC and NALFO and NPC at the moment (though I understand some NPHC groups forbid membership in NIC groups and maybe others).
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