These loans allow buyers to purchase with lower down payments and take advantage of the best interest rates.

I see how using a SDIRA to invest in real estate can help to diversify one's portfolio and could be advantageous overall, but I don't really see how it moves someone out of the middle class trap. 

The real wealth in real estate comes from a combination of your tenants paying down the mortgage and building your equity, long term appreciation, and tax advantages, to name a few.Think of cash flow as a safety net.

An advantage was that if your clothes could be tumble dried, you could simply turn it on to wash and dry, and it would go through the whole cycle without needing to move anything from the washer to the dryer.The disadvantage?

This is a huge tax advantage for STR investors!

With your boots in the ground you can take advantage of these issues looking for prime properties.  

This is the only property I own so I really don't understand someone who is trying to take advantage of an owner who owns ONE property. 

This is the only property I own so I really don't understand someone who is trying to take advantage of an owner who owns ONE property.

Remember bank debt is generally the cheapest input in the capital stack, so take advantage to the extent you can. 

Maybe you can pitch in for the third advantage if you read about it or have personal experience with Alabama.B) Arizona Pros = Alabama Cons:B.1) Bailout By A Greater Fool in some counties.In some Arizona counties, if you buy sight unseen a tax lien on a house that looks decent on Zillow, Google & Cie, then, when you go see the house, you find a burned down pile of carbon sitting a very low value lot, you can simply not subtax.