Ok, here's my take on it.
When a Dom/me has more than one sub, it could be that each sub fulfills a need in Him/Her that the other sub doesn't
The Dom/me could love His/Hers sub(s) in different ways. i don't neccessarily think that it's out of greed or wanting to be, as they say 'the big man on campus'. (although i'm sure there a few idiots out like that)
And then there's the Dom/me that just wants one sub and it works out great, they fulfill each other's every need and want. That's great too!
i suppose ....'different strokes for different folks'. Whatever works for each relationship.
Great Thread!