Other Agents' Buyers

I'm sorry, I have to Vent!  As a seller of REO listings, I get so frustrated when buyers choose to work with other agents THEN they call me directly. I have to tell you a story and I promise I'll try not to get so mad I explode! In Texas we have seller and buyer representation. As the listing agent, obviously we are agents for the seller unless a buyer's agreement is signed. My son attends a private christian school and his principal happens to live down the street from us. I listed a lakefront home in our town and after multiple offers and two failed contracts, my son's principal asked for information from me regarding this home. Because the sellers had not given me permission to disclose the terms of any of the offers much less the previous contract terms, I explained to him the Code of Ethics and told him I could only quote to him the list price of the home. That was on a Sunday afternoon. Monday morning he called and told me he was interested in writing up an offer and told me what terms he wanted on the offer and we agreed that I would get the paperwork together and set up a time to meet to get signatures and other required documentation to present the offer to the seller. Once the paperwork was done, I gave the buyer a call, when he returned my call he told me he had decided that because I was the agent for the seller, he would feel better having his own presentation because he knew what the loan balance was when the property went into foreclosure and he did not intend to pay more than that amount. I understood that and instructed him to contact the agent he had already decided to use before he told me he was using another agent. His initial offer was submitted and countered. Here is my first issue with this story. The buyer countered the seller back (which was fine) and instructed his agent to tell the seller that counter was their best and highest offer. The seller's response was a rejection in offer. The next day, the buyer submitted another offer (higher than his best and highest offer-WHY DO BUYERS DO THIS?) This new offer was submitted to the seller. Before the seller could respond, another offer came over, resulting in a multiple offer situation. A request was made to both buyers' agents to have their clients submit their best and highest offers to the sellers. Prior to determining his best and highest offer (REALLY) this christian school principal asked my assistant (a 17 year old student at his school) to tell him what I already explained to him twice was unethical, the terms of the other offer on the table that he was bidding against. To show how awesome my assistant is, she told him that not only was that unethical but that would get her fired and could ruin my reputation and she would not do it. This part of the story is what I have issues with, A LOT! Please tell me I am not the only agent out there that have clients that knowingly ask us to be unethical? After telling someone, especially someone you see often and have a relationship (as a neighbor and my son's principle) that you would not tell another agent something you wouldn't disclose to them, they still try to get information out of you. The unfortunate part of this story is that this is not the first time, nor the last I am sure, time this will happen. So here is my question back to the buyers, WHY DO YOU CHOOSE TO WORK WITH AN AGENT YOU DON'T TRUST ENOUGH TO GIVE YOU ANY AND ALL INFORMATION THEY FIND OUT? Any thoughts from any of you guys?