There are no money hacks because u would have to change values for ure char. There are only client money hacks in which it makes it look like you have HEAPS of money.
You can scam people by using

in which you change your money to a big amount. You can then ask a person to trade them for a desired item that you want, with you (NOT IN MARKET), and insert a amount of cash in the trade box which wont seem like a scam.
Confirm your amount but dont press OK and at this moment they are thinking your 'Legit' but then you kill them and they might drop the item you desire.
Hope that helps
Hiyoal