There's a great deal more to the Matari RP than the slavery angle, but mostly it's more of an internal thing as Tribal matters are Tribal matters. Whenever Amarr-side players get involved, it inevitably turns into crap from experience. Not because of the Amarrian players as such, but because of the inevitable "no u". There's been a lot of stuff about the Voluval, what makes a Matari and so on and so forth lately. Shakor vs Midular, politics and so on. It's just... well, it's not something that includes the Amarr.
As for "Die slaver..." there's just not enough of it. Everyone and their cat seem to be liberal hugglefuckers these days, looking for every conceivable excuse not to be hostile to their enemies.