For landlord with under 50 units, thats too much and they do not have a good cash rent collection partner (anymore) for tight integration between the two.

I've collected a half dozen of these by googling the internet and I adjust them to meet our needs. 

This is one of the few book in my collection that I have read more than 5 times.

Looking at the Trip Advisor site, operators can collect a deposit though Trip Adviser. 

The rent he collected more than covered the PITI associated with the house. 

And I believe to collect a commission on the HUD (the seller side commission), the broker and agent must enter into an agreement (listing/brokerage) with the seller.  

A PI can also obtain most information you would need to collect from someone.

This allows us to collect a non-refundable down payment that goes toward the purchase of the property, which can be used to cover any vacancy costs if they decided to no longer lease the property (and also not purchase the property). 

Rent collection issues can be mitigated by programs such as Section 8 (aka rent assistance) or VA housing, where rent is guaranteed by government.

We collect the money then take our cut and pass the funds up the food chain to my Capital company and close on the notes splitting them to our buyers.