They're a rare item in cartel packs, which means there aren't hundreds of them about, the rarer the item, the more expensive it is. You clearly only want the crystal for the stats to boost a lower level character, so buy one of the other cartel colour crystals, they sell about 100k-ish on my server.
No one is forcing you to buy that crystal at over a million, so stop complaining.
Revan masks sell for 2mil+ and that's a level 1 item.
That's what they're charging for the crystals on my server