Changes to the Fish Oil stacking affected the LB's to such an extent that there was no possible way to compete with the existing / prior top scores....
It's open to all levels and it's pretty easy. Definitely easier than Siege, Twilight Temple and Crypt of Renown. Forgotten mines' goblin minions are...
It really doesn't work that way - you can't just kill slowly when 1 level up is taking up to +50,000 mob kills in the end game - - and as a PvE Kill...