However when looking at a street there are a few obvious things like boarded up houses, a lot of graffiti (that is not artistic in nature), needles on the ground, uncared for lawn/walkways, people on porches drinking from brown bags, lots of adults up to nothing during the middle of the day (not working at jobs) etc. 

Use natural move outs to upgrade and raise rents.

Since you are asking on the BRRRR forum and I am a 100% BRRRR investor, here's my take: By their very nature most wholesalers work in a legal and ethical gray area. 

Appreciation, both forced and natural, principlal pay down is what creates wealth and covers major capex.

Depending on where you may be in the united States there are fires and floods  Fires both natural wild fires and home fires,  Floods can come in many forms as well and then there are the other natural disasters. 

Supply is both naturally constricted, since most of it is built out already, but also due to more stringent zoning. 

Naturally, it morphed into individual rooms in a way (people treating deposits as separate, paying rent separate, requesting individual locks on rooms, etc.).

CDC: The jobs with the highest rates of suicide in the U.S.It's the nature of the gig, Scott. 

Or how about a city with no natural disasters that borders a peaceful foreign country right on the St Lawrence Seaway?

is this site where folks are interested and active in things of this nature?