6.125% has P&I of $2625/month.5.75% has a P&I of $2521/monthThis is a $104 benefit.Paying $4400 more towards principle will reduce your payment to $2598, a $27/month savings.Math says buying the rate down has a larger net benefit to you up front, but it will take you 42 months to break even.

The chances of you taking $150,000 and turning it into enough passive income to be able to live are as likely as you taking $150,000 and putting it in the stock market and living off the principle. 

Rentals boil down to how much do you net after paying principle, interest, taxes, insurance, and a maintenance reserve.  

I buy foreclosures but never sight unseen.

@Michael Camacci, KP is Key Principle.  

The principles would still be valid though 

Like aircraft checklists and vehicle operators manuals (the -10s), one can benefit from extensive research, trial and error, and deliberate improvement principles gained by the many that have gone the path before. 

Alignment of interest between management and investment capital is a cornerstone principle that is never compromised.

The same basic principle applies in situations requiring a gun only multiplied 10X: if you draw your gun you've already lost and if you're in a shootout you should expect to be shot.To address the actual question though "What is best, concealed carry, open carry or no carry?"

I'm eager to meet and collaborate with fellow investors and industry experts who share my goals and principles.