Completed these two quests finally, now I can invest in my kingdom and make a nice profit. Going to put 10 workers on herbs (most profitable), and the remaining 5 on fishing (can cook for slayer).
Best of all, my chrome extension tells me how much is in the coffers, and how happy my citizens are!
I'm going to go and top up approval rating and cash once a week, as this is supposed to be the optimum amount.