In my experience Kusari is only alive when there are larger Niobium convoys or temporary shooting scenarios (like the GMG wars). The activity is mainly centered around piracy, then lawfuls shooting pirates, then people log off.
I haven't seen many "Kusarians" in Kusari (except their unlawfuls).
Increasing the popularity can be done by mining changes.
Changing the RP to invite more interaction could help, too.
