You seem very angry and emotional and I honestly feel for you.

At that point, the seller has had time to go through their emotional journey.

"We must all suffer one of two things: the pain of discipline or the pain of regret and disappointment"- Jim Rohn...One of my favorite people :)

Coming to the end of a project running the numbers and asking myself if keeping or selling is the best way to go on that particular property.Yes, I’ll save the emotions for my personal residence!

This.This will also be more emotional than logical, never forget that.

Though impossible to measure, and a fraught investment metric there is a certain emotional capital gained by creating something beautiful that you love and can enjoy.

I'm sure that it's taxing emotionally to have to deal with tenants as well as making the commute. 

So family emotions are involved in it too! 

I have an advanced degree in a challenging discipline and it did nothing to further my real estate investing.

As you will deal with every horrible thing in life.... tenants disputes, sleazy contractors, the city who hates your grass, everyone has a sob story and can't pay rent, be emotional ready for evictions and threats, and know your lease and local laws.