I think that this is another NPC/NPHC difference. NPC members do not necessarily have to pay alumnae dues to remain in good standing with the org (as I've gathered NPHC members do). Some NPC groups actually have a lifetime alumnae fee that is paid shortly after initiation.
Everyone's got different types of alumnae dues structures. You also have to consider that there's much more difference between the way an NPC collegiate chapter runs and an NPC alum chapter, then there is between an NPHC collegiate chapter and an NPHC graduate chapter. (Apologies for the clunkiest sentence ever)
I hope this makes sense, I wanted to keep it kind of general.
