They can be dungeon bosses or creeps stronger than the dire game reviewers to make the grind to level 5+ just that tad easier. Also, who wouldn't buy Plat for Raptor Spawner?
I like the BOSS idea. We need a King Lawyer Cat to kill as a raid LOL. The gold is shared among the people there when the BOSS dies, everyone gets a share of the gold depending on how much damage they inflict. BOSSES should be able to hit through walls. =)