I just explained he has an information or experience deficit he needs to overcome in a very short time. 

Here is how I see it: One of the factors needed for Hyper Inflation is for the supply to money to massively outstrip the demand(either through deficit spending or supply shock), think post WWI Germany.

As a matter of principle, I will not use equity from my primary residence to fund the acquisition of others, and it will take many years to save up a down payment to get in to my first investment property.I talked to hard money lenders/private money people today, and they will not only not fund a second mortgage for the deficit, but they also charge a large down payment. 

If your underwriting isn't sound, you may find yourself in a deficit.- You must be in an appreciating area.

Budget deficit or surplus by year:https://www.thoughtco.com/hist...

As you mentioned if the fees collected are not covering the expenses of the property, then the "owner" would have to balance the deficit. 

Great Depression. market disruptions. a trillion dollars a year deficit spending. rumors. panics. personal bankruptcy. a lot of other unexpecteds. 

I'm getting multi-million dollar deficits in the "*Profit if Sold" line on the Rental property tool. 

You can't keep running a deficit-not for the rentals, but for your life. 

I only own one duplex so I could afford to pay out of pocket for any deficit from investing the security deposit.