It's all part of the cycle of poverty and if you have ever dealt with these kinds of tenants you will understand.Kids grow up having their family being evicted a time or two and suddenly, that's just "normal". 

Buying wrong, multiple vacancies at once or sudden capx without enough cash behind...?  

It takes a pretty, low equity house where the owner becomes a 'sudden seller'.  

What often comes up is you suddenly come across your dream property at 6 pm on Monday, and offers are due by 9 am the next day.

Its hard for a contractor to say no when all of the sudden everyone wants their business.I've seen this cycle many times. 

I cannot report them for trespassing ...chicago finest will show up on that beautiful block on 70th and Damen and laugh in my face ..so will the tenants ..and I will only aggravate them to the point that they might trash the place once they will be forced to move out 1 year later by the Sheriff...1 year that's how long the eviction takes. first 90 days notice, then the sheriff need to go out there (who knows when) and give them the notice of forcible entry being filed against them then the judgment..then sheriffs eviction ..I will be lucky of they gone in Sept 2017. cash for keys will not work ...what they gonna do with $2K if they know they can live rent free for a year ...average monthly rent is around $800 over there ...good thing is ...that SFR 3br/1ba brick raised ranch will increase in value...I could make them my tenants ..have them sign the lease ...and hope they miss the payment ..problem is that once I make them my tenants I am responsible for upkeep of the property..what if there is mold in the basement and they develop sudden breathing disorder ?

That is have in case of the unexpected, such as unexpected repairs, sudden or prolonged vacancy, etc.  

I've had the best luck with low equity sudden transfer folks (or folks that have tried to sell but the listing expired or they threw their hands up) with pretty houses.  

I see a recent surge in articles about this project as well.

There are many situations, for example, pro athletes who suddenly make it big, don't have any cash, and want to buy a home.