[Useful goal: Refinance to have NONE of your own money left in the original deal - for INFINITE returns!]...

Life insurance policy designs based on infinite banking or bank on yourself will NOT make sense financially.

Who are you, what was your upbringing, what is your personality like, what good or bad experiences do you have going through life, what movies did you see last week, how good/bad is your girlfriend/boyfriend/dog treating you... these and infinitely more metrics have an effect whether or not someone in foreclosure will sell or not... 

In addition no bank will give you anywhere close to 100% LTV for a rental property, but with creative financing that is relatively normal to carry the entire amount allowing you to scale infinitely fast, you are only limited by the flow of deals you find.  

I borrow 100% of purchase and rehab on most of my flips so my R.O.I is infinite.

If/when you decide you want to be out of a MFH situation, your pool of potential buyers is infinitely smaller and full of investors wanting a "deal".

And since I’m not using any of my own $$ any CF should appear as an infinite return.

The number is infinite.

However, a successful BRRRR can produce infinite return (I have always achieved infinite return). 

In the level, you are using your Seed Money an infinite number of times.