I actually (Being honest) farmed for two days, 9 hours per day on iClassic in the Grotto (2 thousand hours area if you're wondering) and made 20k. Sure, there may be stealer but all you got to do is take a break for a few minutes, chill, get some water, and come back then continue your farming then you'll reach 20k before you even realized it. It's not really that hard to make considering how easy it is to make money on Classic, compare to the other iServers.