I'm not a monitor manufacturer, just an opinionated blogger. But are you telling me that a matte surface would cost more to manufacture than a glossy surface? DPMI support costs a lot? Of my wishlist items, DisplayPort seems the toughest to this layperson, but even that doesn't seem unreasonable.
In my earlier blog entry about the same monitor, I said I'd also be willing to pay a tiny bit more. If I could get the "professional" version with the attributes I listed above for $600, I'd do it in a heartbeat.