The interest that it does accrue is money you don't lose, but rather it does go back into your investments. 

U need to flip the return  75% to the money and 25% to you if have any hope of finding someone to do this that is not friends and family.. 10 to 15% is way to little for the risk of being a gap funder.. if the project does not work gap funder is the one who loses money..

Why would you literally wait until the last minute, when a flat tire or difficulty finding a parking space be the difference between keeping and losing your home?

You have some people in here who are cool with and celebrate losing over $1,000 a month.

You are LOSING money because you didn't even raise rents to cover those increases!

You'll be competing on price with owner occupants who are not running the arithmetic like an investor, so you'll often end up overpaying and losing out on any potential cashflow.I'm also 25, and it's great to see other young guys getting started and building wealth. 

All calculations suggest great investment for 4 bed 3 bath in good school zone, however once the tax estimator goes from $2200 to $9500 due to lose of tax credit from not being a primary residence it hard to see how to get property in SC.

You don't want to get a call 3 months into a project where you have lent money and hear the operator say that they ran out of money and need more money from you to finish the project or you will lose your investment.

Yes, if you have continued cash flow, you can't lose, sure.

If you lose 20% to the PM, then you still have 30~40% profit.