You'll be fire hosed with information but he's really good.

Any time another person feels like someone is trying to change them, or forcing them to drink from a fire hose, it can make someone shut down or be disinterested.  

Hose investors in mind today will most likely want to sit back and get some sort of income stream.

The 110 gallon tub was free, some renters left it behind.The heat exchanger shell was free, it was a 30 gallon water storage tank for an RV.The pump and hose I had sitting around.Fire wood is free.Most of the piping for the exchanger was stuff I had sitting around, but paid about $50 for 50 feet of pipe.Welding consumables, about $10.With a good fire, the water delta is about 30 degrees. 

The last house we did had a combination of PVC, PEX, garden hose, radiator hose, and duct tape (no lie!). 

In 6 months they broke 3 light fixtures - I had reports their kids were spraying a garden hose from the outside of the house into the kitchen, broke a large kitchen cabinet door, broke several plastic pieces of a new higher end Fridge, fist sized hole in the wall, carpet stains and the entire house may need another repaint, damaged woodwork, scratched kitchen cabinets, stole the curtain rods, curtains my wife spent a lot of time picking out stolen, destroyed the back yard - let the weeds grow several feet tall in the flower beds etc.  

I nearly overflowed the pan rinsing with my garden hose (ac unit is in my garage) which would have left standing water in an inaccessible part of the return duct (would have had to cut a hole through the wall and duct to get to it, yikes!). 

It's the people that barely break-even or are cash flow negative when speculating in bubble areas that will be hosed when SHTF.I agree with Jonathan that we're probably 12-24 months from the next top.

Basically it can be the difference between someone selling a car and saying like new when all they did was a cheap paint job and put gloss on the tires versus replacing all the hoses, flushing the system, new transmission and engine.

It cost me about $1000 to get all the supplies needed at the beginning (fresh water and sewer hoses, dishes, pots, pans, bedding, etc.)