I'm guessing they don't have a 30% drop rate like a regular hard node? 8 runs and zero bonus shards.... The chances of that are 0.019% or 0.00019 (70% chance of not getting one, 24 times) Come o...
for a game with say (assuming) 100,000 active players, about 20 should get that. Your math checks out, but its very possible you ve just been very, very unlucky