The idea that this game has a limited number of monsters and also a limited amount of money is really driving me to play it in weird ways.
For example I do all my real exploring of the world when I am worn out, weakened and feebleminded. As long as I don't try to take on enemies, I can roam around as much as I like and fill in all the map squares without wasting "healthy" turns. Even then, sometimes I can get through some combats and use fountains to refill afterward. You can even wander in circles for a full day to get the fountains to keep regenerating. But yeah...if I rested every time I got tired, I'd just be wasting precious money.
Also, I found out that chests are totally random. That really bugs me, knowing that not only can you not grind enemies for money, but you might get screwed over by the random number generator and end up with less money or nothing but the wrong types of equipment for your group.
I discovered this in the lighthouse. There's an easily accessible chest right after the stairs to floor 2. I had saved before going up the stairs, and every time I reloaded and went up again, the loot was different. Sometimes I got 2 items and gold, sometimes I got 3. The value of the chest ranged from 600 to 900.
There's also an easily accessible secret chest behind a wall after the stairs to floor 3, and it has 2 random enchanted items. The first time I opened it, I got 2 enchanted bows...and I only have one bow user. If I hadn't known the chests were random I would've just taken them, but now I can reroll those items. The second time there was a helmet and gloves. I have enough points to be an expert in prime magic and learn Identify, so I'm going back and getting that so I can get a good haul from that particular chest.