I dont know exactly what quest makes the most, but look for quests that give you 100 or more quest points and they usually pay well.
The quest that gives you the most money in HorseIsle is Grey Slate's Gaudy Crown. It can give up to 50,000 points.
Candide's Golden Sheep Quest gives you 400 QP. So far, I think that's the most. HarryPotter Palomino
The quest that gives you the most money, 50k, is grey slates gaudy crown.
Grey Slate's Gaudy Crown gives you the most money on Horse Isle ($50,000). Candide's Golden Sheep is next ($40,000)MiddayMoonCremello Server
Most Quests on Desert Isle in the Desert Require Lizards.
Look for a monkey on Vine Isle in the southern most patch of jungle
They are everywhere.No kidding, you only have to talk to the people in the hutsand most of them will already send you on a quest.
Miley Cyrus gets the most money
rock isle for 12.5k or appleton rock shop for 11.5k :)
The quest called Purchase Sword of Nulgath. The reward is 200,000 gold, and you must be level 30 to accept the quest.
he gets the most money
Kuwait gets most of its money from selling oil to other countries