It actually saves me $9 per month. 

I know she can stop paying on the Promissory Note as it attaches to nothing. 

For instance, let's say you purchase property in a city where rents rise by 2% per year, while inflation is at 5% per year.

I use my license for multiple activities: Of course- comps, when buying and when selling, tax data- to see what I am about to pay when i own the home ( for long term holdings), check the DOM (days on the market) for the subdivision I am either buying on, or when I plan on selling, etc. 

When you say similar pay do you mean amount or will you also be paid the same?  

My goal is to buy one rental per year with price between 150k-250k for the next ten years (if i get to keep my job). 

A 50% LTV on a $120K house at 7%, 30 year Am results in a $400/mo interest payment.The cashflow on your existing duplex goes to $1,000 per month, but now you can buy another just like it so yoru cashflow goes to $2,000 per month.  

You will make more from loan pay down, yes you SHOULD have some appreciation.

I can pay some va's 400 to make 1,000 callls per week.

I've also avoided paying Capital Gains Tax on selling my crypto.