Migdalin
Terrarian
If a drop currently has a 1% probability, some people will get the item on the first kill while others will still not have seen the item after 500 kills. Neither result seems desirable. Better to have the item drop every 100 kills. That way, if you do the work, you get the reward, and you don't get the reward until you've done the work, even if you're a streamer.