Add a few hundred more per month to cover insurances, cell phone, gas, lunches, advertising (whether it's business cards, coupons, flyers, etc) basic line of chemicals (prespay, emulsifier or rinse, general mix of spotting chems, degreaser, reducer, oxidizer, urine/odor, etc., and now your looking at having to clear nearly $1,000 a month to cover your costs before you make a profit.
I'm not saying it can't be done, but let's be realistic. Things add up quickly and before you know it, your struggling.. unless you'er operating uninsured, totally by word of mouth and only cleaning with hot water.