Depends how well your product turns out bud wise and how well it's trimmed. if you have fluffy weed you cant sell it. Thats usually due to a weak fertilizer program or a weak phenotype of the strain. A good strain is 80% of the job, not including costs of pesticide, fertilizer, general power bills. If you want to get into it have a 60×60 ft shop and have three 20 ft × 60 ft rooms all burning with 1000 watts. Plus a 60 ft veg room. If you have a program in place you can crop off every month. Currently we've got a harvest off every month with 12 pounds per room. But then you have to know how ro grow the strain and do cuttings to set up another round. If you get into it professionally be prepared to drop bank on it. But thats just my two cents