I'm gonna have to agree with the sentiment that these drops are way too low. Let's say that someone really wants Nidus, and has the streams running for 5 days straight. This means that they have 120 drops. The chance of this happening is obviously related to the chance of it not happening:
Again, that's the chance of it not happening. The chance of them getting it after 120 drops would be 21.4%. This means that 78.6% of players are getting disappointed. That's unacceptable.
Now let's say there's a bit of selection bias in the amount of people who are coming here to the forums and say the actual chance is higher...here are some numbers:
0.5% chance: 45% of players get it, 55% of players disappointed.
1% chance: 70% of players get it, 30% of players disappointed.
30% might not seem too bad, but these are the people who got every drop for five days straight. On a 1% drop rate with 60 drops you'd get 55% of players disappointed.
I don't really mind, personally, but I do agree with you guys that it's wrong; you don't want a large portion of players feeling disappointed after doing something like this. And to be honest, I kind of expect the drop rates to mysteriously increase for the last day. Once people get what they want the likelihood of them inflating twitch numbers goes down, so ideally they stick around until the last day to finally get what they want. That inflates the twitch numbers, and that's good for business.