I think in order to make money, making your own scrolls and potions instead of buying them would save u a lot of money..
If you make excess, then you can even vend them for profits..
Production and vending often provides a nice steady income, but it's the slower / more boring part of the game...
I guess the other way is the farm for rare stuff and sell it at nice price.. but those are often hard to find, a bit of a hit and miss..
Some more money making tips can be found
here