An unpaid sub can get a lien against your property.It is also possible that this is his tactic or that he isn't a very good manager (it was the middle bid after all).All in all you need to make sure the job gets done so I would:Negotiate with him to get the lowest price you can to get the project completed. 

I DEFINITELY don't agree with many of the tactics.

They do an excellent job of pulling the selling-strings and using emotional selling tactics.

Use your gut…if something seems shady it most likely is…do not let someone change your mind with promises or salesman tactics.

I suppose you can try to take the buyer's appreciation in years subsequent to closing, but I am not sure whether such a tactic is even legal whether the property is sold and title passes, or is held in escrow. 

That's all great sounding but it boils down to just a sales tactic.

You may want to try the same tactic with appraisers, real estate attorneys, local commercial insurance brokers, and small town bankers who work with community banks in those local markets. 

How you do is is just tactics, which will differ depending on the Realtors comfort zone, experience, knowledge, as well as his initial impression and evaluation of the homeowner.

Or know where we can learn more about options and tactics? 

-What is the most successful marketing tactic you have used and why?