Don't visit Palmia until the city resets.
You can capture monsters with Monster Balls or Rods of Domination.
But it's kinda hard to get 60k.
There is a good way to get money but it's difficult.
1. Go to Derphy and talk to Noel in the pub.
2. Accept the quest, buy the nuke (it costs 12k) and start the Red Blossom in Palmia quest. Bomb is heavy and you may need to drop some of your items at your house to carry it.
3. Go to the inn at Palmia and use it on the top of teddy bear there. You have 10 turns to get out. If you manage to reach the 2 left-most cell columns of Palmia by, you will not be hit by the explosion. Or, use an escape scroll and let 8 turns pass by. Next, use the nuke on the teddy bear and walk a step. You should then be teleported outside. Walk to the square left of Palmia and then back into Palmia again. Reenter Palmia and you should now be on the very left of Palmia city. Keep walking down until you reach the bottom-left edge of Palmia. The nuke blast won't reach you here.
4. Stick around Derphy until you have a higher Karma so guards won't attack you. Methods of raising your Karma is here:
http://elona.wikia.com/wiki/KarmaAfter you done all this. You can get money by prostution. Your karma won't take a hit and you can get money as long as you keep getting NPCs drunk. Also, your charisma will raise very quickly. Getting 60k will take like 4 minutes if you are quick. I managed to save up to 1.000.000 (1M) (one million) GP with this method in like half an hour.