And never being “at risk” is it even sufficient to legally bind a seller?  

It is difficult to decipher whose opinions, judgements, and authority are fiduciary.I do believe it does take money to invest in real estate - not necessarily for a down payment but to have sufficient reserves for the investment (which does not seem to be discussed much).

Sufficient infrastructure: Companies select locations with major airports, highways, and a large population of potential workers.

You could ask them to just monitor your wallet to ensure sufficient funds, but then they'd have to trust your security policy and procedures are at least as good as the exchanges.  

If the appraisal came in at the price what was not sufficient for them?

It is my understanding that the 5 day notice is not sufficient by certified mail if the tenant never signs for it.

First, most investors and owners of real estate related businesses are in one or more of the following situations1- they’re unable to duplicate their expertise that drives the ROI and they are at their personal max capacity as to time2- they’re obtaining high ROI by use of excessive leverage 3 - they’re obtaining high ROI by taking excessive risk4- they hit correct timing in the correct market, and this is not necessarily repeatable with any probabilityIn order for an investment or business to scale, we need the ROI (on a risk adjusted basis) to be sufficient to cover a PREMIUM risk adjusted return to passive investors; all expenses of managing the assets and the business, and a significant return to the “sponsor” providing compensation to him making the work, risk and time worth while. 

I believe if people make money and there is sufficient housing supply, housing will become affordable. 

Otherwise, his rental portfolio is sufficient to sustain him.

FHA has a self-sufficiency rule that makes it difficult unless you put A TON OF MONEY down.