For example, in beach markets like the Emerald Coast of Florida, where I am, ACs need to be replaced more frequently due to salt air corrosion.  

Is adjusting comps by VALUE OF EACH characteristic of a property just a rule of thumb or is this a method everyone should use for they’re ARV?

But when it gets interesting is when you start analyzing these cancellations at the "lowest common denominator" we are starting to see different characteristics and commonalities a lot of them share.I'll put it to you this way...by looking at the court docket, reading the documents, researching the borrower i can give you a very good idea  close to certain if a sale will get canceled and why.There are many telling signs that will increase the chances of a cancelation: how old is the foreclosure action?

I've been working with the same small company for a few years now, and though there hasn't been a flagrant problem, I'm feeling like the owner has a marginal attitude and is frequently on the edge of being mouthy with me.

The products change/improve frequently, I have not kept up.

Isn't it something how frequently this basic premise is completely over-looked.

Normal Freddie Mac property standards.No FHA "self-sufficiency test" that kills transactions at the last minute.Underwritten and funded in-house, no send-off to an outside Agency for approval.That's all great, but the problem that frequently came up is historically (and for the next 2 months) you couldn't own other real estate.

We have a project in Belize and send funds frequently.  

Another acronymTIC:- While a TIC investment is a form of shared ownership, the TIC interest is not the same as a partnership interest in its economic, tax or legal characteristics.

Using the BP calculator to run the numbers on a few properties with the characteristics you want will help you get a feel for the market and the potential ROI for you.