I can't imagine a world where 1 ring and/or 1 necklace is make or break for killing a raid boss. So, I'm not sure who "had" to do it.
Then again I don't raid.
Well, imagine a 25 man raid.
Now if each person has 1 ring with an additional 100 of their primary stat, then that's essentially 25000 of a primary stat.
Now imagine you're wiping consistently at like 1% of bosses HP.
Check your math, it's 2500 of a primary stat, not 25000 (BIG difference).