My net rental income was $300 to $500 a month, not enough to cover the mortgage payment (PITI) so I'm negative on what was supposed to cash flow on paper.

So even with me living in the 2/1 it cash flows just barely (at least on paper) but it looks pretty good once I would move out.

Additionally, considering the time value of money is crucial, as deferred gains and tax efficiencies may improve long-term returns despite upfront losses being largely on paper.

You can find higher ROI (on paper) here and probably in other cities…but the probability of actually collecting rent significantly decreases.

So, he made an average of about $20,000 per loan for pushing a pencil and a cheap paper.

It might seem like a kindness to provide a printer to a traveling professional, but until they invent one that works on every device, every time; that doesn't need paper at two in the morning; and has cheap toner that refills itself, we will pass on that amenity.I am sure there are other examples for all 4 quadrants, but like @Allen Duan wrote the important thing is to look at amentities through the lens of the end user (with an eye towards the "competition").

But I know the best way to keep discipline is with clearly spelled out rules, on paper and signed.  

We include a couple days of essentials like toilet paper, etc to get them by. 

Podio is extremely flexible and extensible.All that being said, here's the big challenge with Podio:  when you first sign up for Podio, there's a demo workspace with apps, but it can still look like a "blank sheet of paper." 

It doesn't mention requiring paper receipts at all.