I think adding the functionality to call a top number of hero's and list the total gold gained when they went on a mission would be awesome. There could be two versions as well, like a "current" top 10 and an "all time" top 10 which would include hero's who had died but still made a ton of gold in their lives.
2) ### Events
I like the idea of creating a certain randomness to spice things up, this can be implemented in several different ways, but one thing I thought of was having a blood moon event that would temporary increase the difficulty of all dungeons but also drastically increase the gold received from the monsters at that time. I could go on and on but overall Events could be really cool.
1) ###
Gold Scoreboard2) ###
Events