In Oblivion, I always found it funny that you could try selling something to a merchant for, say, 20 drakes and they would refuse the offer and laugh in your face about it. So you go into haggle and you lower the percent by 2 and the item is still worth 20 drakes. But this time, the merchant accepts it.
I understand the system they had in place and the rolls against luck and mercantile, but was I the only one who would scream at the monitor that they were the same price?