Spawned heroes have a significant chance to drop gold piles
I'm afraid you guys missed the second part of bug report from here http://brightrockgames.userecho.com/topics/1057-heroes-somehow-drop-gold-at-gates-in-home-realms/#comment-8470
Just now I restarted the Casita home realm and spawned a few groups of
heroes with 9 level. Since I didn't have any minions or traps in the
whole dungeon, no one could possibly die. And yet I already have 3 piles
of gold right at the gates. If I'm not mistaken, it sometimes happens
when the gates spawn sappers.