Splendid Silent Crusader Shoulders

Is there something I am missing about the 50% shoulderpad scrolls from the silent crusade? Like they havingg a working ratio lower than 50% or something? Because otherwise I don't see why people would choose to spend billions and billions of mesos on chaos scrolls.

Errr is my shoulder pad not proof alone why some people choose Chaos over Shoulder scrolls?

For one they add more attack, at the chance that they work, and don't take away attack. Second, you don't need to do that boring quest line for days on end to reach shoulder scrolls. Third, they can't explode your item....

common sense lol. And not everyone spends "billions and billions" I spent less than a billion on my shoulder pad..