It is in fact the least expensive way to live assuming one is reasonable about what they rent.

The tenants are about 3 months behind and she is just done with it.She wants to sell me the property, however she prefers to offer me seller financing because she wants a monthly income and does not want the lump sum payment her reasoning is because she doesnt want to be taxed..

For that reason alone I would choose a SFH always over a condo.

Verify their source of income....look at how the treat their car...and....cross your fingers..or look for another tenant...remember..people rent for a reason...

I have about four savings account which totals a little over 3k for different reasons like Emergency (2k), Travel (1k), a credit union saving (~300+), and investments (~350 and adding [Had more but I spent it some stuff to educate myself and get started with the stock market.

You have a little bit of an information advantage most sellers don't... buyer is acquiring for a reason, it's not just random, you have a record of what prices this single buyer has been buying the other units. 

The average income of people who live in these areas is also reasonable.

There are plenty of different reasons a place can stay vacant that may not be realized righy awat.

The reason why is those who tell you it is passive are not being honest.

Three times usually works if your demand is reasonable and the tenant feels an obligation to pay you.