Also, since they are transaction-based, they get their commission and can disappear. 

My thought is that because they ask for no deposit and the first month free that they will place a renter for cheap really quick and then disappear before ever making a payment to you.

In a 1031 exchange I had to hammer both with  threats due to the agreement to cooperate and the constant surprises of new partners and unfilled liens with an approaching lapse of the 180 day limit. 

Any excuse you give (you SHOULDN'T) will be met with challenge, bargaining, threats and sob stories.These people are wasting your time and driving away other customers in your business, and making trouble for you with the municipality, to boot.You're also being too soft and they can smell it on you. 

@Chris Seveney - my guess is either a cease and desist letter or threat of lawsuit for slander. 

Several properties on Auction.com have disappeared from any marketing when the reserve wasn't met. 

A few idle threats but nothing more.

I've never had any lawsuit threats over 20 years.

Lenders and economists alike are speculating about the threats of "phantom debt."

Would you want this threat next to your spouse and children?