It's better only to clear the first stage and teleport back. It can be solved very fast and you have a short way to enter it again. You can do a lot of money in no time, even with level 10.
Ork lair is nice, but it takes more time to get there. Grinding works much better/faster with Maze (lvl1).
If you only do level 1, there are only about 10 - 15 minotaurs, and they don't always drop the best selling item minotaur axe. Even if they do, bluesteel and minotaur axe both sell less than bluesteel greatsword, while bluesteel greatsword is a guaranteed drop by orc king plus occasional thunder that sells for even more and bluesteel mace that is equivalent to average axe drop.
If you are farming for gold, orc lair is definitely better than the maze. I go straight for the orc king and it takes at most 30 seconds to get there and 5 seconds to get out of the maze, quick save, and quick load to reset. As a rogue with dodge ability, I can bring literally nothing in my bags and bring back a 20+ stack of small potion, a 10+ stack of battle plans, and at least 25 greatswords plus about 5 - 10 thunder and some other stuff. Each full run yields at least 20k now I start to take only the best selling items and takes less than half an hour.