I think there are many principles that he teaches that should be considered.  

With that said I do know a few hard money lenders who operate on the principle that they have to like you to lend you money, but most  

If the principle pay down is over $500/mo at least you’re still “making money” and actually a little more every month.

Read a text on real estate principles, law, and finance.  

But hey, once you embrace these principles, you'll be striding confidently toward a future full of prosperity through real estate investment."

Flat fee can work well for people who are knowledgeable in real estate principles and law, have experience negotiating deals, and have time to devote.  

Same principle for rents.You posted this under land and new construction.

.:  10% return relatively risk free due to less interest payment and more principle paydown without significantly effecting the leverage ratio.   

any ground up dev. is the highest risk project *whenever* there's interest rate volatility regardless who is the sponsor/executioner would be.These are just so basic principle.... even ground up dev project in 2019 is losing value right now due to higher rate.

Real Estate or ART or Jewelry or your kids baseball card collection.The principles apply to whatever you are buying.