You missed the joke, and it was way late in arrival.... Standard issue response when anyone on RIU asks "How much will my yield be?" is always "About a pound" just to show the reality of how impossible it is to foresee.... light, temps, RH, Ph, pests, CO2, strain, pheno of strain, age of mother plant..... hundreds of things go in to the end yield, too many variables for anyone ever to say "You will get X" all you will ever get is what others achieve with similar resources...
Never ask for a yield forecast.... its like asking what the meaning of life is, or why women are so necessary to life.... but so batshit crazy....