One thing I found interesting is there was this one stack that in one play would NOT join me. The dialog cursor didn't show up, just the attack cursor. Their leader even said "Ah, Morrigan (my sovereign's name), Layea (the city) looks ripe for the taking!" Or something to that effect (never did attack though).
I reloaded and then the next time around, they WOULD talk with me. Wanted 375 gold. Okay, fine, I had 700+ and for a stack of equipped fighters, sure (their leader had 7 (!) defense - all my units have 0 defense)
Then - somehow, I was in the red for 220 gildars. WTF. How can I be in the red by paying 375 when I had over 700? Was that 375 PER UNIT? I guess so (should either be some indication of that, or the price quoted should have been 375*number in stack). Also, another question, why was I even able to recruit them? I can understand if they were a "package deal" but then shouldn't I have been told "you don't have enough gildar!" (and then maybe they attack me because they thought I was screwing around with them).