They are basically using rental arbitrage and the investor is the landlordArticle here on BP discusses how this is a win-win for everyone.

The remaining $150K in this case is still eligible to be offset by any NOL from my rental properties from LLC #A.You already explained the basic idea yourself, so there is no need for us to do it. 

A basic rule I tell Colorado STR buyers is that you can go cheaper on lesser used items but not the big stuff. 

But if they don’t even bother to fill out the forms to apply, or get a basic job to make ends meet, or borrow money from family or friends/ somebody else besides you, then they can’t stay.

If you think you can achieve higher returns simply investing in low cost markets it means you don't have basic understanding of investment principles. 

Basically I’m ok paying someone to vet it.  

I basically laughed. 

What you’ll need to do depends on the system’s condition:💨 Basic tune-up – If it’s in decent shape, a service might be all it needs.❄️ Partial replacement – Swapping out the indoor unit or condenser can extend its life.🔥 Full replacement – If the system is ancient (or missing), just bite the bullet and install a new one.Pro Tip: A new HVAC can be pricey, but it’s a huge selling point.

Basically your time, resources and experience will dictate this ppsf. 

Basically you don't want to engage them.