FSBO Buyer's Agent Ethics Violation?

[Tara Piantanida-Kelly]

I'd love your thoughts and feedback on this:

Buyer's Realtor: "I have clients interested in seeing your house. Are you cooperating with Buyer's Realtors by paying a commission?"

Me: "Yes."

Buyer's Realtor: (Shows house to clients. They love it.  The next day...) "My clients want to make an offer on your house. Before I submit the offer, I want you to sign a commission agreement for 3%"

Me: "We'll split a 3% commission 50/50 with your client, or we'll pay 100% of a 2% commission."

Buyer's Realtor: (no response)

Me: (2 days later) "Hi Buyer's Realtor. Are your clients moving forward with the offer?"

Buyer's Realtor: "No. They decided against it."

Me: "Was it related to your commission, or was it something else?"

Buyer's Realtor: There were no comparable properties to support the price you were asking."

Me: "They changed their minds after wanting to submit an offer? Did you tell them that we would only offer a 2% commission?"

Buyer's Realtor: "They changed their minds after I ran the comps for them."  

Me: (Riiiiiight.....  I ran the comps too and posted them to our house's website.)