You need to take a more professional approach to operating your business, leave your emotions back home in your personal life.

YOU won't win this illogical emotional game.

Alternately you can charge her to install a keyless push button lock but I suspect if these are temporary visitors and they you have to change the codes later. 

Homeowners ALWAYS over-value their homes, because they see the comps too, and think their house is equal (if not better) due to their own emotional biases.When speaking on the phone to prospects, after getting to know their motivations and pain points, offer your solution.  

Since you like the steep learning curve of a new adventure, perhaps the time is right for you to put in a temporary burst of work now so you can let your well-researched investment generate passive income even once the novelty has worn off ;) The BP rabbit hole can be very addicting!

In my opinion just from a lifestyle standpoint I do not see why anyone who could afford to own would not unless they knew it was going to be a very temporary situation.

My home town has a whopping 1900 or so residents, but with virtually no available rentals, including the three doors that we own (a 1BR Duplex and a 3BR SFH).I started studying REI in the early 2000's, but I was emotionally attached to paying off the mortgage on my residence.  

Do not let your emotion bother you with anything.  

When a person goes through a divorce, everything is upside down...it is a mess, emotionally, financially, spiritually.  

The hardest part (for me) is that I get emotionally attached to "home".