You are correct that it can be called but you are also usually given the option on either adding to the account or selecting what to sell.  

If you offer first, I would factor worst case on rehab and offer based on that.

I also find the “Max HOA” and “Year Built” filters pretty useful, especially since mandatory HOA dues and deferred maintenance can both significantly dent in cash flow.

Boward County (Fort Lauderdale) has 8 months' worth of inventory, almost 18,000 homes for sale. 

Based on the question, I'm guessing you are trying to get out of a deal and you would have to come to closing with cash because the property isn't worth what you paid for it.Yes, you can probably get a higher price by selling the property subject to.

And very few take me up on it..

I just know at least on my development here in Oregon as I field many of the buyers agents calls when my wife is to busy to talk to them.

You don't have to spend money  out of the pocket on searching Redfin, making some phone calls, making offers and posting ads on Craiglist or whatever local media you want to use to sell the property.

If so, finding the right PM is key—I’ve managed out-of-state rentals, and a solid PM makes all the difference.Best bet is to get referrals from local investors rather than relying on online reviews.

Go with someone with solid google reviews and over 5 years in business and move on if needed.