Let's say we do a sample of 1000 runs in act 1 as MP5. So, if the drop rate IS 50%, we would get 500 keys out of the 1000 runs. If we get 50 keys from 1000 runs, then that's a 5% drop rate.
Get it now, Einstein?
Still don't get it? Try playing roulette and throw 100 times red. YOU CAN'T. The longest streak of a roulette table hitting one color is 32 times red. That happened in 1943. This streak hasn't repeated since. Can you comprehend the prcentages now or are you still going to post idiotic comments?