That is your mortgage payment Principal & Interest.

Principals are happy and investors are happy.

Sure it's scaleable by reinvesting all of your principal plus profits into each new deal.The more you ultimately invest in a syndication the more you make as you already mentioned.By rolling over your capital each time you're essentially "scaling up" and generating more income.

I know you said you were doing it on principal, but I believe the suggestion from Cara Longsdale above is a better option for you to follow unless the loss is greater financially. 

Don't try and low ball the principal amount.

Leave home on 5.69% interest rate mortgage. 12K mortgage would be paid off in 5 years without any additional principal payments.

We also must disclose when we are a principal in a transaction.

Save half for a down payment, put half towards paying down the principal faster.Just my 2 cents.

Getting the mortgage "paid for" makes a bigger difference in the future years when there is more of the montly payment going toward principal vs interest.

This does NOT automatically go away once the loan-to-value (LTV) dips under 80% by either principal reduction or appreciation, or combo of the two.