Wow, just wow... Acting like Black Belt can be farmed? Somebody needs an education in what "drop rate" means.
5% from the NQ HNMs, 5% chance of claiming the HQ HNM so that's not any better unless your entire LS is botting. 10% (generous) chance of dropping from the KS99. Maybe a solid week of farming for 99 KS, at least, without completely destroying your attendance in all other end-game events. So, let's say it probably takes 10 stacks of KS for one item, 30 weeks until you've got a reasonable chance of obtaining black belt. 30 weeks with no leveling or doing anything besides farming KS, going to required end-game events, and having a real life. And that is assuming that nobody in the group of 18 fucks up during any of those 30 fights, which is nearly impossible, so add another 5-10 on for various stupid things or the wyrm deciding he doesn't want to die. We're up to the better part of a YEAR farming black belt, without doing any leveling.
On the other hand, we have Brown Belt. At level 55, I stopped leveling MNK for about 2 months. Farmed up about 4 mil, bought O-kote, Spartan Cesti, and a second Sniper. Spend one WEEK, understand, WEEK, singular, out of that camping Nue/Dodo/Morbolger, 1/6 1/1/ 1/1 on drops.
Personally, I won't expect Brown Belt before 55, because I try not to be a total hypocrite, but it really should be required at 50, I know a decently geared MNK could solo them at that level, Morbolger as /NIN or /THF with gear.
Again, as a refresher.
Black Belt : Better part of a year, nothing else accomplished during farming.
Brown Belt : A week, maybe 2 weeks if drops don't like you.
...and with that I just made myself late to class, looking forward to a hopelessly ignorant response soon.