This will let you learn as well as manage the couple guys who you might hire for specific items like trim and tile etc.

Amazon FBA is just basically getting products and selling it on amazon, its a bit like Ebay the difference is when you sell an item on Amazon they have alot more features and data for you to work off like whats the sales rank (how well it sells for its category) how much other people are selling that specific item for and so on.if you ever noticed that amazon sometimes has a seller name other than the products company its usually sold by a sole person. 

You can't, its a waste of time for all parties ,All the best,  I suspect this may be one of those market specific items.  

The tenant actually replied  after my response and said they really appreciated me for explaining the why and she was very happy to have a landlord that wants to put specific items like that on paper so she can look back on the lease and know what she can or can't do.

Yes, that's great IF a person is coming with "a" specific question on "a" specific item, but that's not engagement is it, it's a REI Wiki. 

I even wrote a letter that outlined the specific items and their repair costs...none of which I could have known from the showings...that was prompting the price reduction request. 

It is like walking into a grocery store, you are not there to buy everything just specific items, so your "WHY" is like writing up your grocery list so you buy the right stuff.The bonus characteristic is GUTS, having the guts to make the right decision when the opportunity arises.If you can master these you are well on your way to being the next Donald Trump.

If I'm looking for a specific item (say, a stainless gas range), he'll call me when one comes in & he's usually amenable to playing "let's make a deal."

This is why I'm being meticulous in making sure all normal wear and tear expenses are separate from the specific items listed that were required to be accomplished by the tenant.   

Then, I start adding on top specific items if they are needed like, new roof, new windows, new kitchen cabinets, etc.