Buyable NPC fighters

[Huscarlton Banks]

CSR has this, but there are a few obvious reasons why NI will probably never have friendly NPCs:

I) People will exploit by afking with NPCs, if their kills give exp/loot.
II) If NPCs do not give exp/loot when they kill, people will get upset at people who bring NPCs.
III) Warband A.I. is ridiculously bad, and given how teamplay (read: holding chokepoints) is important in the higher waves, having NPCs would likely be a disadvantage in any setting that doesn't involve just charging the bots in an open field.