After Brownhair eliminated the more violent, extremist part of their leadership (i.e. Mordecai Jones), the others obviously mellowed out. Mind you, we wouldn't hear about them anyway. They seemed to only appear in the Gemini Sector, and Priv is the only game that takes place in that sector.
Yes, the kill scores were pretty high up in Privateer, but consider the opposition. For the most part your main opponent is flying a Talon, which even flown by a good pilot (the AI ain't 'good') is still a weak ship.
Compare that to the 'main' games (WC1-P), where the oposition is usually better armed/protected than a civvie craft would be.
Earthworm: Oh, you know, the usual. 500mhz, 64mb RAM, 40x CD ROM, 8mb graphics card... That sort of thing. Although I suppose it should be pointed out that it's a Celeron. I'd've preferred a proper processor, but Celerons are just so much cheaper