So true, I mean let's take for example charged gear of agility. The ring itself is 22% drop, and according to wowhead the chance of getting the agility version after the ring actually drops is 3,4%.
0,22 * 0,034 = 0,0748
That is about 0,75%, or 1 in 133 chance to get agility ring as a drop when you kill the boss. Monkey ring is more usual at around 10,2% chance, which is ~2,25%, or ~1/44 chance to get the monkey ring when you kill the boss. The chances seem pretty low but not THAT low. You can end up in an unlucky streak but should eventually get them drops if you keep grinding
I did not find too much info on the spawnrate or in other words: what is the percentual chance of meeting Dark Iron Ambassador when you got to gnomer. But as far as the actual droprate goes, with a 30% droprate to get emissary cuffs as a drop, and agi enchant chance being 12,5%, we end up with a total droprate to actually get the agility version of the bracers being 3,75%. Monkey version again has a little bit better, 15,6%, so multiplying that with 30% that is the droprate of the bracers that would be 4,68%. 1/26 for agi version, 1/21 for monkey. Not bad, but however the dark iron ambassador is a rare, you will have to remember he's not there most of the time. As I said I do not have exact info on the mobs spawnrate, but I would give it a rough estimate of 20% (someone please correct me this if you know any better), so you will get these rings in roughly 1/100 dungeon runs.
TLDR; Honestly,
if you want every BiS gnomer rng item for your spec (bracers + 2 rings), you will most likely have to spend a lot of time and hundreds of runs to get them. Of course you can be really lucky and get everything within a couple dozen dungeons, or have really really bad rng and need close to 1k runs to get everything, but those facts aside the bottom line is that it will most likely take a huge shitload of time to farm all these items.
edit: misread the quote so scratch that
