Opinion needed on a correspondence with a seller on eBay

[martindl]

I'll offer a different perspective. I'm not the seller btw and wouldn't respond that way if I was, but.....

Your response could be read as
"I know I've committed to buy the card in its listed condition and for a contracted price but I've decided to add a contingency. The contingency wasn't something you'd have to deal with if I wasn't the winner but I was and now you will. Let me go ahead now and tell you how much I'm really likely to offer you i.e. I'm expecting to get a good discount when I point out the flaws of the grader and why this card is worth less than I've already agreed to. Btw, you can tell I'm a good guy because I've told you I'm interested in other cards you have."

Too cynical? Perhaps, but I've heard of a few too many people lately who win an auction and then want to negotiate. I do think the seller should have handled himself differently but its understandable to me why your approach would set off alarm bells.