That is a very good question, actually. They are a pretty awesome race, but you're right, we don't see them much throughout the main stories. Actually, they have been featured a bit more on The Clone Wars, especially at the ends of both season two (three part story where Bossk teams up w/ young Boba and Aura Sing) and season three (a pack of them kidnap young Padawans and hunt them for sport).
We'll probably touch on them more on our show after we finish covering the player character races.
Anymore thoughts? Keep them coming!
MER Network Co-Producer
TORWars Guild Flunky: Glassau Harkoenen, Sith Warrior