KR refuses to localize for other regions. That's it. That's the answer.
KR can keep the rates as is because they have 10k people and bots playing. With that many dropping things, healthy amount of bots, the economy is less affected.
NA has 500 players on a good day. So the drop rate is far inadequate for that player base, but nothing can be done on NA's end because KR wont allow it.
So either deal, or get 8000 more friends to play.