The best ways in AQ worlds to make money will be written here!
Go to the crash site and start all the quests there and just keep killing laser dwakels and redoing the quests it gives you about 7500 cash.
Go to undead Swordhaven (/portalundead if you finished story) pick up the Fire Gem quest. Keep killing the fire mages until the gem drops. Turn it in and sell the staff, and Bam! you have 12500 gold.