The quest that gives you the most money, 50k, is grey slates gaudy crown.
It really depends on which quests you're talking about. However Esroh Legends is a good HI2 help site. (I use it and it helps, A LOT!)
Complete two esophagors quests then return to the brain tree and collect your reward. Note that it costs A LOT of neopoints for the esophagors quests so be prepared to spend from 90k to 1 million. If you are poor or on a budget, do NOT do this quest as the prize will usually not be worth the money from the esophagors quests.
Well, that's a matter of opinion. Feel free to discuss it on the Discussion page, but please not in this answer! There are over 500 quests, and everyone has different preferences. There are numerous high-paying quests such as Candide's Golden Sheep. Numerous people will suggest you do that quest if you need money fast. A lot of people will suggest that you simply go down the quest list.
to get easy money on aq worlds is by talking to evryone you see and see if they have a quest normally you get quite a lot of money by doing quests
its worth a lot of money,
no
A 1943 copper penny is known to be worth a lot of money,
yes it is
a lot of money!!!!
Hockey, Soccer, Badminton, and other famous sports are worth a lot of money.
You can't Sell things that are worth a lot of money.
no not to much now