Do they just want the monthly income stream...

They are no longer a low cost producer.  

Low construction activity—paired with a national housing shortage estimated at 3.5 million units—continues to support investor conviction, especially in growing metro areas.Retail also performed well, with vacancy near historic lows and constrained supply due to record-low development.

Quote from @Tim Aiken: I have a house in Bellville and I would like some help on deciding to fix and rent or sell the house, so I may need an agent to discuss the options,  looking at a timeline of 1to 2 months before the house could be listed if that is the best direction.  

or would it only offset my w2 income? 

Ultra-low interest rates and quite low RE prices.

Quick question, would you rent to those on social security income and what kind of proof of income would be acceptable?

Im house hacking in NYC and planning to get a HELOC to invest in the next 2-3 unit property.

Now, I also thought, "Since the house is smaller then at least my mistakes will be smaller" and that was enough for me. 

You should develop a policy for whom you will reject and follow fair housing laws.