Huh ??
Could it possibly be because NOT ALL channels are HD ??????? You probably only have 20-30 HD channels on your cable, and as you stated, they are in the 700 range. Everything else is SD. 
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Living Room
Panasonic PT-50LCZ70 50" 1080p HDTV, Sony Playstation3 80 Gig, Onkyo HT-R667 7.1 AV Receiver, Yamaha NS-6490 Main, Side and Surround Speakers, Cadence C-17 Center Speaker, Acoustic Audio HD-SUB15 15" Subwoofer, DISH ViP 722 HD DVR, Panasonic DVD Recorder/VCR, Monoprice cables
Den
Viewsonic NX2232W LCD HDTV, RCA RT-2500 5.1 AV Receiver, ESS-308 Main and Surround Speakers, RCA RT2500 Center Speaker Onkyo 10" Subwoofer, DISH ViP 211 HD Receiver, Magnavox Blu-Ray Player
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