Hillarity.

[RukiaFae]

I easily see at least one bis 210 every time I do diadem hard. They are not as rare as you think.

Yes you may see one per run but did you get it? That was one drop for eight people for two hours worth of time. It's called RNG some people have great luck others don't. I have done multiple runs and only got one piece of 210 that may not be bis. Out of that entire run only three pieces of 210 gear dropped. People act like you are guaranteed bis gear every time you step foot in there. It's mostly luck and a lot of time.