The reason for such unstoppable momentum was due to the weak resistance from both monsters and players. Yes. Despite know of the Kobold King's accomplishments, some players still dared to venture into Black Grill's Cave. Some of them did so in hopes of trying to get a kill on the boss while others wanted to take down a few kobolds but a majority of them did so because of the lack of resources maps.
With a lot of players now avoiding Black Grill's Cave, it made things a whole difficult for others. The other maps were slowly getting crowded and the prices of certain goods, mostly those from the Cave, increased. Some saw this as a window of opportunity since if they could get their hands on those goods, they could make a lot of cash.
Men die for riches like birds do for food.