Can I ask a deeper question... is something drawing you to invest via one of these platforms?

It will take consistent action and focused effort. 

You will figure out what works best for you and when you do stay consistent with it.

But to someone who has only lived in the suburban McMansion area their whole life, it might be a C/D (there is a bus stop 300 ft away the consistently has someone with a brown bag in hand, people keep their houses nice, but they are mostly 70+ yrs old, cars park on the street because most don't have garages or driveways).I agree with @Erik Whiting, there are people in all income brackets that are good, responsible people.

City Code Enforcement: Properties that are consistently getting warnings and citations for failure to care for their property could easily be rentals where the landlord is over his head and would take an out, if presented, but can't afford to fix up the place to sell it.

You could even wholesale off the deals that don't work for you.If you have another full time job or anything else that prevents you from being consistent with it, feel free partnering with up with a current wholesaler. 

Definitely a good point though about the consistent depreciation.

The reason being is that it is consistent, not based on usage like a utility and you would still need to pay it even if nobody was living there.

I have a friend named Andrew who seems to be consistently finding them for his clients.

However, this could turn out to be one of those situations where you might be correct legally, but not get a result that is consistent with that at the local level.