That's reasonable, people deserve to get paid for their labor. In this situation however, the difference between them is that DisplayPort is a royalty free VESA standard. So while manufacturers have to pay for the materials and such to include it in their devices, they don't have to pay any additional fees to license the standard. HDMI on the other-hand is a "brand" of proprietary connector/interface (kind of like how "Velcro" isn't the actual name of a product, it's a "brand" of hook and pile tape), so not only do manufacturers have to pay for the materials and labor related to physically acquiring and installing the connectors, but they have to pay both per-device and annual licensing fees for rights to use the HDMI product.