1% drop rates... a thought expriment.

[Poringing]

This is really the maths of probabilities in action.

If it is really 1% drop rate: (I doubt it is; should be slightly higher as it was raised in patch 2.25 but still towards the low end)

You need 69 runs to have a 50% chance of ever seeing a mirror (getting it is another story).

If 100 people ran levi ex 100 times each, statistically 37 people would not have seen a mirror.

If 100 people ran levi ex 450 times each, statistically 1 guy would not have seen a mirror (the world's unluckiest guy). Also, one person would have seen the mirror 10+ times, but there is a 25% chance he has no mirror... or 2 mirrors (assuming DF groups)!

A static 8 man will need to run about 765 levi ex to have a 50% chance of getting everyone a mirror (or 1350 runs to raise it to 95% chance).

Finally, for all things probability related, you need infinite runs to guarantee a mirror.