Then, no. I cannot imagine why you'd see 1 denar, even if you were a character with 0 in Trade and a lousy CHR score.
You're running on Warband 1.154+ and it's not pirated, right? Don't tell me that it is, btw, I tend to report people that do that
Anyhow, that's a bug and it may well be a bug I haven't fixed yet... but if you're experiencing this, I need to know a lot more.
Like, what difficulty setting you're playing on, what class you're playing, the exact name of the items, and what's showing on the screen when you mouse-over the items- you should see some text indicating the sales % you're currently seeing.