Lets say you are making a little over $1000 a month, which I do not consider a lot unless you are single and live rent free at home. Do you not pay for gas? Now lets say one of your machines break down, thats a big chunk out of your monthly income. Your also banking this success on the fact that you are not running a legitimate operation. You dont pay taxes and you dont pay insurance. If you are paying, then you do not have financial success unless you have no living expenses.