30 naxx runs, 1 ashbringer. Mathematically it’s almost impossible as the droprate should be 100/6= 16,7%
DST, 21 runs, 0 drops. Considering gruul drops 2 non tier items, drop chance should be 15%. Mathematically it’s almost impossible to have such a bad luck
The skull of guldan 15 runs, 0 drop. Same crap basically
HSH and BC trinkets from ZA. 43 runs, saw 2 hsh and 1 bc, while saw around 20 of other usless trinkets to drop.
tldr drop rates on specific items that people hunt for are definitely much lower than they should be.
Blizzard scams players even like that probably trying to keep them subbed for longer