Sorry, @Negat1ve. Gold Mines were designed primarily for newer players, and we failed to release them in a way which made them fun and appealing to our most talented players. I regret that it was released in that condition. Bosses weren’t providing useful currency before, so I don’t miss them – many of our elder players only bothered with them for quests. Mines do provide less gold, though few of our top players were really in need of more gold either (though for those who were, I apologize for the slight reduction in it … most is still earned from events and season prizes at least).
Like I wrote in another post, our awesome accomplished players like yourself find themselves with a lot of “catch up” to do that they would’ve normally done while leveling up over several months. Unfortunately, this impedes completing recruiting expeditions at high levels, and I’m sorry for that. We wanted to make this transition smoother, but for various reasons we couldn’t. We’re planning to replace recruiting expeditions with different sources of coins in the next big release (so this issue will become redundant), and in the meantime Allied Raids provide a new source of coins (it doesn’t fully cover recruiting expeditions for top players who were doing lots of quests, but it helps a little).
Mines will be worth unlocking, but it’s okay to spread out the grind and not rush too hard to level it up (which I know from first-hand experience is pretty rough).
Sorry we weren’t able to orchestrate a smoother launch for our best and most dedicated players. We’ll try to make future transitions better.