Everyone is entitled to an opinion. I never said anyone was in bed with each other, I was however identifying the reality: the listing agent and in house selling agent are nominally incentivised to do the deal in house. So, when Dave's story starts to go conspicuously downhill - he specifically points out the issue with the in house broker, etc - it was my opinion that the in house relationship (along with the down payment) may have had something to do with it. I received 3 calls last week from buyers working with listing agents who felt their interests were not being protected because the agent was clearly incentivised if they paid more for the property and they had a legal duty to protect and guide the seller, not them. Even with the disclosure sheet they didn't understand. These calls are heartbreaking and unfortunately it happens.
Also, I love that you come after me with an assumption (and opinion) of your own. Unless you are the listing agent on this particular deal or know the listing agent and had access to the contract, you are assuming that their agreement had this language you quoted below and/or was an exclusive right to sell relationship/contract. There are other contract options for sellers. Again, that is contractual language that the seller must agree to and sometimes they don't ... " unless otherwise agreed in writing." Also, not everyone uses the GBREB's written contracts, as the state does not require or mandate that you do so, and you, Jonathan, should know that as a licensed real estate agent.
Anyway, your response seems to be slightly aggressive. Not sure this is the right platform for you. I apologize if my response rubbed you the wrong way - I see you are in fact a listing agent yourself (and represent both parties in transactions?). I am sure you are a great agent - there are a lot out there :) - who would never let an in-house deal steer you into unethical behavior but it happens a lot and there is no need to hide that from Dave or anyone else reading this post. It's just another opportunity to educate home buyers.