easy way to get money,
get slaver letter (5000)
then explore on tile left of home base
win fight, take everything from the fight
go to shopping arcade sell all but 1 item clothes to nyan
then go to arcane shop and buy as many essences as you can
enchant the one remaing clothing with slave enchant
return to tile and explore to fight
enslave the person
travel to slavers alley
get the item back from new slave
the sell slave
rinse and repeat.
I haven't played in a while so this might have finally changed, but despite all the lore saying demons are above the law, you can capture and enslave them too.
The turbo version of this is to go to one of the purple dangerous tiles and fight the demons there.
then once you've beaten them, take all their stuff and enchant the cheapest item and then put it back on them, then sell the rest. You can even have sex with them first to get more than enough essence for the enchantment.
You can just stay on the same tile and keep hitting explore until you run out of essence or patience.