Dish should be supplying component cables in the box. All HDTVs, no matter the age, will have component inputs, so no worries about DVI or HDMI. At the volume Dish could purchase component cables, it's unacceptable that they not include them. If the arrangement is that the installer supply them and get reimbursed, that's reasonable too.
This is the same argument I used years ago in Dish's favor when people said they should supply HDMI cables in the box.
In the end, if the customer is upgrading to HD service, when the installer leaves, they'd better have an HD signal all the way to their TV.
Thank you.