I'm curious about this too. I would argue that Darkmoon Card: Greatness (ilvl 200) is still very close to BiS for some classes or at least closer than the iLvl indicates. I suppose I could just equip the highest level trinket to improve my score but I'm interested in exactly how gear score is calculated. If it's solely based on iLvl, I'd suggest that DMC: Greatness should use 213 or 219 for calculations rather than 200.