Where is the benefit to the end buyer here? 

I think there is value in ADU as long as it is legally done and can be legally rented.On the sale side a benefit can always be an in law suite.

It will familiarize you with the basic terminology and benefits.

But almost zero percent of NOD owners can make it through the selling / moving out process go get this benefit. 

You mentioned "The only problem is that these are 6 month lends, I'm 1.5 months into this, so any work that I do now will not reap any kind of benefits until 6 months from now."

You may also need to provide additional documentation, such as proof of income and employment, and may need to have a co-signer who is a U.S. citizen or permanent resident.In terms of buying with an LLC, it can be a good option for some foreign buyers, as it can provide additional liability protection and potentially offer tax benefits.

They may justifying paying more by claiming they’re paying the premium for the “business”, but since the “business” and the real property are inseparable the property owner will still benefit from the increased value due to the arbitrager efforts.  

And I feel the ideal portfolio can benefit from the diversification of both.I feel directly owned properties are great because they give me maximum control and the ability to tweak them exactly how I want.

If you are specifically targeting travel nurses, it will benefit greatly if the home is near a hospital. 

Private funding from a relative may provide flexible terms and reduced financial risk, but formal agreements are necessary, and interest paid is deductible for you but taxable for them.Traditional investment property loans offer stability and tax benefits like deductible interest and property taxes but require larger down payments.