Wheat Grass: Piggies Drugs

20 cents worth of wheat berries, a little dirt and water and you've got yourself a 6 inch square plot of Guinea Pig drugs. I swear, if you gave the girls an unlimited supply of this stuff, they'd eat until they burst! Fortunately, the stuff grows about two inches a day. They sell it as "pet grass" in the grocery store, and charge $2 for a 4 inch pot of it. I bought a pound of the seed for $6, and expect to get about 40 6 inch pots of it. So, am I cheap, or only rational?