I said that was fine and would circle back at a later time but when I asked the agent for details on how they got to their current valuation, I didn't really get a good/logical answer.Offer #2: SFH in 'B+' location.

The audience is stock investors who are equally passionate and successful in stocks as the BP community is in REI.

Apply that logic to your offer criteria...

Sure you picked a great forum, the audience here is generally affluent and will have money.

So you do the most logical thing, you work with those clients who allow you to us your time in the most efficient way possible.

You will have to eventually make a judgement call for what you feel makes most logical sense (and alot of times you'll rely on accuracy of your numbers aka financing of your rental to help you do this).

I just want to know realistically and logically why, if there truly is a great deal out there, it wouldn't get bought by one of the hundreds of more experienced investors right away who know the business inside and out.

Sell after appreciationAfter 10 years you have not met these goals and now the market is softening.You are not running a business or acting in a logical manner. 

In my neighborhood where homes are listed between $900k for a tiny fixer-upper to $1.8 for a decent size turnkey, I have seen smaller homes are so hot, high in demand by first time buyers where as larger homes go stagnant due to the higher pricing (due to the sq. ft. not because of the location)and targeting smaller audience group who can afford that higher price point.

You are going to get very skewed responses because the audience is self selected.