Point taken...but look at it from this angle. Let's compare the prices of the HD Metallic packages, and the non-HD packages, price-wise:
AT60 (29.99) to HD Bronze (49.99) = $20 difference for HD
AT120 (39.99) to HD Silver (59.99) = $20 difference for HD
AT180 (49.99) to HD Gold (69.99) = $20 difference for HD
No matter which pack you have, you pay $20 for HD. Now, if NG-HD is only available to Gold subscribers, that means that the Gold subscribers are getting 1 more channel than bronze/silver for the same amount. I understand Movie channels being different, but not regular channels. If they are going to follow this model for future HD additions, then the HD package additional price should vary like the base price does.