Gentlemen confidentiality... Does that even exist these days 
Sure it does - but not on a website that's accessible from any Internet-connected computer in the world. He posted the sale on eBay, not under a shady tree in the school yard! (And as a side note, your grammar and punctuation is atrocious!)
I would agree that the trade talk probably should have been kept private, but your admission that you overpriced an item to bring more attention to your other sales does not set well with me. For that alone I would never buy an item from you. I'm not sure what your idea of "priced to sell" is, but all your items look overpriced to me.
EBay is a free marketplace. He charged a price that even he considered high - but he would have been thrilled if someone had paid it, that's for certain. It attracted enough attention to start negotiations for trading for another rare deck, the Blaine Microsoft deck. I might consider it overpriced, you might consider it overpriced, but without a free marketplace with people asking for whatever prices they want or think they can get, exactly how is price determined? What sets the worth of the deck?
Someone else might think that's a bargain and be happy to pay it - and if so, more power to them. If enough people agree with us, though, the item goes unsold, the auction ends and the item may return at a lower price. Eventually, if this becomes a repeating pattern, the price goes down to a point that is reasonable for someone and it sells - unless we're talking about an item so valueless that it will never sell at any price.
I don't need to explain to you how a free marketplace works. Pricing strategies are nothing new, though they typically work in the other direction, like the loss leader - a supermarket that sells pumpkins at Halloween so cheaply, they're losing money on them, but they make up for it because the pumpkins get customers into the store and it's only the rare customer that only buys the pumpkins and not the other items in stock.
I worked for a fruit & vegetable stand in my teens whose owner lamented the pricing tactic - one nearby store was selling them for a penny a pound, far below the wholesale price he was paying to get them from farmers, so while the supermarket pumpkins attracted customers, his only attracted vermin while they rotted on the shelves. What he should have done instead was fight fire with fire - sell his for a penny per two pounds (or even for free!) for any customer spending a few bucks on something else he offered, like the apple cider, apples, potatoes, etc. His competitor was a larger supermarket, seemingly better able to afford the loss, but supermarkets tend to operate on very tight margins - my suggested tactic might have boosted his business enough to allow him to absorb the loss and attract customers away from the supermarket.
This pricing tactic is the opposite, but not entirely invalid. We're here talking up a storm about his sale - and who among us took the time to click through to his profile at eBay and look at his other offerings? If you did, his tactic succeeded, even more so if you actually bought something he was selling.
