It's because when the Colonial ID was first made, the IMG and ourselves were still the same NPC faction. Even now we're not fully divided. (It's complicated.)
Same like our prohibition on docking on Kruger and Daumann bases, if that one still exists.
P.S.
Moar Nyxes.
<span style="font-familyalatino Linotype">
<span style="color:#000000">All morons hate it when you call them a moron.