Then I repeat the process.Like you said though, it's about your risk tolerance.

($1300+ minus $300 payment for $1,000 cashflow.)Doesn’t sound repeatable.  

I highly recommend David Greene's book, "Buy, Rehab, Rent, Refinance, Repeat" It's the most comprehensive book on the subject

Only issue comes if person does not execute the option and purchase, but you can just repeat this same strategy with someone else.

Does the brrrr strategy work if I live in my first brrrr property and then refinance/repeat and rent out my second brrrr property?

I think my hesitation with the house-hack option is, it isn't something I could repeat, bc renting a larger home like that would be tough, and unless code changes, I couldn't rent the basement separately whenever we were to move. 

@Jaysen Medhurst I updated my original post, annoyingly it didn't format as I wanted to so I'll repeat it here.

There are so many things I could say here, but really if your WHY is strong enough, then the small stuff (and big stuff) will not affect you as much and you'll succeed.

Like @Allan Smith said, perhaps you have struck gold in the partnership category and it's time to rinse and repeat! 

You find a couple of good cash buyers that become repeat customers that buy multiple delas.There are no secrets, silver bullets or unknown techniques in this business.