If you are using it to buy a turnkey property which needs to produce cash flow to be considered a viable deal how does buying turnkey(Little to no cash flow) combined with HML(High interest only debt) make alot of sense financially? 

Your time is best spent producing the revenue that allows you to invest in the first place.That includes using local agents you meet and feel are a good fit for you, property managers, possibly buying completed properties like the one you posted here, and outsourcing as much of the process as you can as you get started. 

If you find something that works well as a short-term rental, but doesn't work well for you as a home, you'll have money but be dissatisfied when you live there.You don't even need it to produce a profit.

The one parcel that we will develop into buildable lots will probably be after we have built out/sold off the initial 30ish lots that are ready to go, which should produce capital and prove demand. 

Since then, my cabins have tripled in value - worth easily $800K or more, and have produced $696,XXX in rents.  

Right now you may see them as less than suitable for partnering with, Maybe rethinking your own position about making money with them might produce a profit.

The figure for without compounding makes perfect sense to me.For compounding, I took PPR's example, and calculated the annualized return:With the following numbers:A = $1,431,237.45P = $1,000,000.00t = 3This produced an annualized return of 12.68% over the 3 years with compounding.What am I doing wrong in this calculation (I'm certainly not a quant)?

When was the last time the weather stripping was replaced on the doors and windows or someone went around sealing the tiny window sill cracks with silicone?

I love their youtube channel as well that produces 2 or 3 videos a week. 

I sold 2 properties that were taking up a lot of my time and were producing very little of my cash flow.2.