So your income isincome = $1500 - $0 + (-$1000) = $500.While the scale may be different, rehabbing is no different than any other manufacturing business.

That's when started to investigate manufactured homes.  

Pay him the contracted price, split the overage, and get a written warranty from the manufacturer regardless of what product you finally use.

How to Find, Buy, Manage and Sell a Manufactured Home Community by George Allen is a little dated but a good place to start as far as books go. 

My typical guest is the guy who sold his house and has nowhere to go for 40 days or the guy who's installing a new production line at a local manufacturer and will be on site for 6 weeks and prefers a house over a hotel room or the lady whose kitchen caught fire and the insurance company is putting them up in a house for a month while the repairs are completed.

Ford tells them that once he perfects the manufacturing of the horseless carriage, it will be the best mode of transportation ever invented.

I have some experience dealing with Chinese manufacturers, and they're fairly easy to swindle their prices down to nothing, since all they really care about it making the sale.

I woke up with both guns blazing when I understood how and why the wealthy create more time, manufacture time and work on the operation producing them multiple flows of passive income. 

The best way to answer your "Systems question" is to encourage you to do what works best for you.The goal of a system is to automate the process so that it manufactures a desired result.

Look into the ad budgets of companies like Procter and Gamble, Car Manufactures, Cell Phone Companies, or Insurance Agencies.