I still think it boils down to licensing fees. Licensing the HDMI spec, and hence, putting a HDMI port on your device, still requires a $10.000 fee as far as i know. Thats quite a bit to make up for by selling a $200 item... Oh, and a royalty of $0.04 applies as well. In comparison, DVI is "grandfatherd" was as far as i know, from the get go free from licensing fee's, and royalties. As is DisplayPort. So if you want "newer" you should ask for DisplayPort... But that means no analog signals, i believe, and well, that just leaves DVI.
Somehow i think Jens, or someone close to him, researched this. My numbers might be out of date, but they should be in the right neighborhood.