Quote Originally Posted by Vnolan View Post
1. They are unable to detect the bot
2. The response time is in the weeks
It's these two.
GM's have no way to detect bots so they have to observe the player before determining if they are using a bot or just grinding/harvesting quietly (there are oddballs who do that, I guess...).
SE generally takes care of botters and RMTs in large groups one-or-twice-maybe-three-times a month.