Hmm.
To be honest, (and I hope I don't offend anyone in saying this!) I'm a little hesitant to really engage in any serious Amarr/Minmatar roleplay, and the slavery thing is probably the prime reason. It just seems to completely dominate it as the centerpiece. Like, to start with, I'm not super keen on the subject just from an out-of-character perspective, in that it's something I've seen explored to heck and back in other settings and have kinda had my fill of. (And wasn't that interested in to begin with.) This wouldn't be a problem, on it's own. But it sometimes seems like it's all the roleplay for those two sides are about.
Like, to give an example, I've been in one-on-one RPs with about 4 Amarrian RPers with Gwen, and three out of four of those had them wanting to attempt to enslave her, out of which only one mailed me in advance to ask if I was interested in pursuing the plot thread. Now, I wouldn't mind something like that happening on occasion, since RP obviously becomes dull if nothing unexpected ever happens on trips to procrastinate over drinks.
But more then half the time? That's a level beyond. There's a point where it ceases to be a feature for RP with that group and becomes THE feature. And though it's been more subtle in Gwens dialogues with Minmatar, the subject does seem to tend towards slavery and linger there, too, for one reason or another. It's like a themantic whirlpool that tries to pull you in if you approach someone involved in it, sometimes! It's a little scary. And I already find myself running out of doors to open with it.
I like the Caldari/Gallente conflict better (and find it easier to become invested in people invested in it) because it seems to be more a battle of ideals. A temperate war with abstract motivations and variable levels of involement that doesn't really need to have a proper, final revolution, so long as it continues to simmer on in interesting manner. But I feel like the Amarr/Minmatar conflict is, in the inverse, so hot that it seems to define those two factions, which in turn makes it a bit more dissatisfying when no final resolution can ever be reached. I mean, the Minmatar are never going to be all freed, yet neither will the Amarrians manage to enslave them back again. The lore seems to demand anger at the situation, but all it's going to give anyone involved is a headache.
Maybe this is why it gets grilled down to a base level most of the time, Azdan.
I also... speculate (and I hope I don't start to sound like Gwen here by going all "Power=BAD") that the dynamic in slavery tends to attract people who are more interested in the power fantasy side of roleplay, as opposed to the co-operative fiction element. I'm sure I don't need to elaborate any further on this point. Needless to say (though there's not anything wrong with that) it kinda doesn't mix well with what I'm going for, most of the time.
Not that I'm suggesting that applies to even the minority of people involved, of course. But it's something that makes me a little wary, as well.