You are missing lawn care, pest control, replacement reserve, admin fees and Management costs. 

In that option your 50K will control 200K worth of real estate that your tenants are paying off for you.

Then it might be possible to install a remote-control drain with a button at the front of the tub; I've seen one model and there are others, but it might be hard to get enough access through the side wall to install the control mechanism below the tub.

Things are likely going to go wrong that you will have little control over.

Like I said, the Listing Agent has no control and does not even field or have any knowledge of the number or amount of any offers until one is accepted 

Item (f)(5) (1) PLEASE PROVIDE PURCHASER(S)/BORROWER(S) NAME(S) SO THATWE MAY CONDUCT OFFICE OF FOREIGN ASSETS CONTROL SANCTION LIST SEARCHESPRIOR TO CLOSING.(2) PLEASE PROVIDE SOCIAL SECURITY NUMBER(S) FOR PURCHASER(S)/BORROWER(S)SO THAT WE MAY CONDUCT FEDERAL AND BANKRUPTCY SEARCHES PRIOR TO CLOSING.Item (f)(6) SATISFACTION AND RELEASE OF NOTICE OF FEDERAL TAX LIENAGAINST Minnie Mouse IN THE AMOUNT OF $51831.96, DATED 8-17-2010, RECORDED XXX  AS DOCUMENT NO. 123456789.

Those providers don't allow me to control what the tenant pays and they can also dispute the charge later. 

It might also tell you why the high vacancy.ROI looks good, but did you make sure to calculate all expenses like insurance, pest control etc?

I would ignore her.This entire thing probably falls under "acts of God" which means it is beyond your control and you can't be held responsible.

RE Investors will hate this analogy but here it is - purchasing your own real estate is like picking individual stocks, where you are in control.