Potentially buying a used car that's listed as 3/4 of KBB price because owner made mistake in the model's listing

At first I thought there may be something wrong with it.. maybe a scam (I'll be checking it out first later today).But I realized the pictures of the car (12 total) showed model [x], which is premium, while in the ad he wrote it (twice) as model [y], which is the lowest priced model and right at his listed price.Would it be horrible for me to jump on this? I feel conflicted that he's potentially losing 30% of the max profit to what's likely a simple mistake.Tldr: guy listed the wrong model.. will potentially lose 4k off of the total listing (now under 10k). I want to buy it at the listed price.. couldn't buy it at kbb price. I am evil? Should I do the "right" thing? via /r/cars http://ift.tt/2smGCCC