Where does the money come from? (BRRRR)

[Kevin Cardona]

Hello BP Members! This my first post. After being a member of BP for 2 years and soaking up as much of the priceless information on here as I can, I decided to finally get started on my investing journey. I will be taking the BRRRR route. I've read up a lot on the BRRRR method but one thing I can't seem to understand is where does the money (and interest) to pay back the private investor or hard money lender come from. I know there are rare occurrences of "no money down" investing and that as a new investor, I'll be giving away the majority of my profit, if not all.

Also, I would like to know your thoughts on approaching a private investor. 

Thanks in advance,

Kevin