You should feel very bad. You knew the item was worth more, yet you did not inform the seller and pay the full value.
Evil, scammer, terrible...
In reality I don't care how you felt. It can be looked at from both sides. Some would call you a scammer for walking out with that sweet deal. I, personally, would give you a high five.
What I am pointing out is everybody sits high and mighty when they have to pay full retail or beyond for something, but they have no problems giving their friends a fist bump when they get a score at well below the actual value of an item.
Everybody loves the free market when the pendulum swings in their favor, but cry foul when it does not.
So who is the bad guy? The one who chuckles over getting a super deal, and then posts here to recieve virtual high fives? Or would it be the guy who listed an item for a stupendous price and some doofus, who has to remind himself to breath, actually bought it?
It's all good to me and I see nobody being a scammer or gouger. A douchebag, yes. A scammer or gouger? No. In times like these a thesaurus can be a big help.