Because I run all four SoO wings on 5 characters a week and maybe make out with one or two pieces, and that's with 3 bonus rolls on each character. But typically, if I do win something, it's the exact same item I already have.
I've seriously tried for a weapon upgrade on each character for the past 5 weeks, and gotten nothing. I remember winning a decent amount when I was gearing up my shaman when the raid first came out. It's like the drops have gotten worse and worse over time. Did they just stealth nerf it to force more of a grind to keep people busy?
Even if people did ninja stuff back in Cata, I think I still prefer the old system. Seemed like rng was in better favor back then.