Also, and this is very much a side topic, but as someone with multiple of the huge money sink endgame vanities, you do generally want to change up what you're doing for money occasionally anyway or else you slowly go insane from pressing the same buttons over and over again, or worse, burn out and stop playing, thus not making any echoes at all.

Hearts' Game was a welcome occasional distraction from the popegrind for me while getting cider since the opportunity cost is pretty much negligible