Is mining really that much better than harvesting in the swamps? Can you make currants faster from peat, barnacles, and fireflies? They seem to be worth more, but I hadn't really ventured there since launch until today.
Cerulean: really? My experience with Ajaya has been mixed. When you say "a day" how long did you spend to come up with 50k?
I also have Mining IV, but I find that there are so many people there now that you only get one whack at each rock, whether you have Mining IV or not. And yes, you get lots of bonus rock, but you don't get bonus gems, and a lot of the money is in the gems.
Recently, I've been wandering the caverns instead of jumping around Ajaya.