In a recent call to the company I learned they recently hired 4 folks to assist with the production of the fluids, so there is some labor cost involved. But, IMO this is minor compared to what they appear to be able to sell. Even if there are a total of 8 folks involved in the production of 10,000 gallons/day, how much could their annual labor cost amount to? Even if one estimates 8 x $50K/year = $400K ... this is still peanuts in relation to the potential annual revenues from the fluid sales.