I don't think he was attacking your listing. There is no problem asking a certain price. I personally do not see you getting that price for this game even on ebay. Almost every game sells for an average of $35. The ONLY game that sold for over $50 was from Lukiegames and "magically" that auction has been relisted so odds are the sale did not go through or they are just trying to jack the price up.
I would expect to get $39.99 shipped one ebay if it was me.
I'd take a $40 gift for that game. That's like getting $46 on ebay minus ebay and pp fees which is top end of where this game has actually sold.