You'll never make money if you don't follow these principles.

When the property sells the investor gets paid back the principle first and you split profits from the sale 50/50. 

It was the same when I was actively involved as a day trader in the stock market.

Flipping, Wholesaling, Owning Rentals, Crypto, Stocks, etc.

The strategy you're referring to could work in principle, but there are a few important considerations.

I’m a firm believer in that before one masters any creative or wealth building strategy in real estate investing, they need to master three things; (1) real estate PRINCIPLES, (2) real estate LAW, (3) real estate FINANCE.  

I wouldn't pay off the house entirely, as you can deploy that cash into more real estate or stocks.

I have someone who wants to do a land contract sell price 500k 70 k non refundable down 2 year balloon 3500 month payment. 2000 principle 1500 interest 4% percent.

Same principle with owner finance. 

But when it comes to rankings, I've heard numerous people say once they mastered Airbnb and applied the same principles to VRBO their rankings came up.