The crown earning rate is just way too slow, even in elite difficulty, because you have to spend a really long time playing the game to earn some crowns, and you have extremely hard missions like The Return Of Ur and The Gauntlet and other tier 3 missions that nobody plays doesn't reward enough crowns, the only mission that rewards more crowns is The King Of Ashes, but playing that level over and over just gets so boring,
And when you play around depth 18-22 you barely earn any crowns and feels like a big waste of time, maybe we just need more levels like The King Of Ashes except more crowns.
What's your opinion?
Crowns are at an okay rate of earning. If you're not spending your earning constantly and play an arcade gate a day or so, you'll be fine in earnings.
King of Ashses only gives so many crowns because it's in an even strata. There are also hordes of enemies in that level, all dropping loot.
However, you can easily make more than the king of ashes missions if you get several danger rooms and/or an arena in stratum 6 arcade. Heck, I've made more crowns in a tier 2 run than king of ashes because of arenas and danger rooms! Arenas net about or above 3k crowns per entire floor cleared.
Bottom line: no. Crowns are okay.