Look here http://www.primalseeds.org/npk.htm to get the NPK of most organic materials. Unfortunately CGM is not included, but you can find sources of potash if you feel a need to include it. Grass is a nitrogen hog, not a potash hog, so I'm not worried at all about the apparent lack of potash. One of the cool things about organic program is that nutrients do not leech out of the soil. Instead they bind with organic "sponge" elements called humates. When the plants need nutrients, the nature of the sugars exuded by the roots will change. These sugars activate different microbes to provide a sugar/nutrient exchange as GlorifiedLawnBoy has explained. I would change a few things. I don't see any need to mow at 2 inches ever, unless you are seeding. And if you are seeding, then CGM is incompatible. So if you need seed, you'll need to reconcile the use of any corn products as fertilizers. I would change the nematodes, too. I applied mine two weeks ago to take care of fleas, ticks, grubs, and thrips - all of which are living in the soil over the winter. So I would move them to early spring with another app late in the summer. One thing that is important is to get control of the client's automatic watering devices. If they think they can sustain a healthy lawn while watering for 5 minutes twice a day, every day, they need to be retrained. Just because something comes from a living plant, that doesn't make it valuable in organic gardening. Some examples include ricin, anthrax, mycotoxins, rattlesnake venom, nicotine, and alcohol. So how should you price the program? As a starting point I would use the hourly rate that plumbers get in your neighborhood and use that for my wage rate. Then for materials, assuming you're buying wholesale you charge retail at the going rate in your neighborhood. Out of the wages and markup, you should be able to pull a normal profit that allows you to pay yourself, provide maintained equipment and fuel, and save for retirement. If you know you can cut 5,000 square feet at a plumber's rate for $25, then that's a good place to start the bidding. I don't see any reason this plan would cost significantly more than a complete synthetic program. The CGM is the only thing that costs a lot more than the synthetic product it replaces.