just to satisfy my curiosity as i'm not familiar with that game, why do you need to run 3 clients at a time?
Since most likely anyone from steam is looking its because I play an RP server, you can buy the maximum of 2 drug plants which level up after time, then you sell it for the in game money.
More plants = more money. With using 2 extra clients I am able to buy 3 times the normal amount. Meaning I am very rich
Being smart has its advantages, I know it is cheating but we deserve it for thinking of it.