He also buys supplies in bulk and gets a hell of a discount because he pays on the spot . 

I think they're trying to get it right because demand is growing faster than supply, ie they need more hosts. 

@Charles Greene that strategy has worked for many investors and still can today but with the increase in OOS investors, the limited supply, and the tightening lending market, run your numbers conservatively.

We looked into these...https://www.mqtekindustrialsup......but decided to just raise all rents & supply free washer dryer use with new scratch & dent appliances.

Or is a cold water only supply acceptable?

If I rented SFH, I would supply a fully equipped kitchen, but only hookups for washer & dryer.

The question comes in on common elements (utility, water, heating lines that supply multiple units or Common walls, etc.).   

The factors are figured out by checking specific supply and demand and average days on the market.

Once the closing takes place, the seller has zero incentive to cooperate with supplying them.

In fact, it remains unclear who owns what— all because the supply chain of “professionals” in the buying/selling processes of residential real estate aren’t really professionals.