But the overall concept here is correct, right? 

Essentially, to VERY liberally paraphrase the concept "you can 'co-invest' with a disqualified party (yourself or another one) ONLY on an original purchase or transaction.

Maybe you have seen me around, I am Sean, a high schooler currently from Shanghai American School interested in real estate investing; I started a while ago when my friend (who now left) introduced me to this concept, and I have been researching ever since.In the short term, I plan to get involved in some deals some way or another, either by helping to find deals for other investors or actually owning them myself (maybe with a partner).

Therefore, when I purchased those homes I really had no idea what I was doing and did not even know the concept of "evaluating a deal" existed.

It involves relearning and understanding new definitions of:1 - Cost2 - Assets3 - Risk...and the implications of concepts to REI, such as:4 - Exponential returns instead of linear returns5 - Living on the "left" side of the equal sign, instead of the "right" side.6 - Taking control of the system, instead of living with the answer (I guess that's just #5 restated)....and refocusing on making money "move" and making "friends", instead of "standing still" and remaining vulnerable to its enemies.

. :)  I'm also pretty sure that your concept of "at a loss" is not very accurate, but I will let your CPA deal with it.

Admittedly, house cleaners hate bunk beds but there’s hardly any simpler, more direct means of adding revenue than unlocking family stays, particularly in summer months where longer stays are the default.

They're normally expense and give a very very broad overview of the concept and not much on the specifics of your area. 

These numbers will vary but the concept is the same.Again, I say we are wasting everyone's time if you are planning on leaving Texas in the next few months and you don't have the 20% down required to buy.  

Same concept landlord never pays turnover fees there are always paid by the outgoing tenant by training the tenant to not damage the property and that the inspection will charge the securities posit to return the rental back to move in condition.