That is not really what I consider lowballing. The lcos that mow factories have ins, pay workmans comp, and taxes. The guys that own the company dont do the labor and they make a small profit on their investment. You have to figure out if you can make a worthwhile profit at that rate.
Lowballers are guys that are not paying taxes, have no ins and pay employees in cash. They can do the same jobs that you do for half the money and still make the same profit.