Complaining about ABC's 12:30 pm college football broadcasts

Why aren't they in HD? Every other game that ABC and ESPN broadcast in full 16:9, 720p resolution. The 12:30pm (pst) games, however, are always 4:3, 480i/p video upconverted to be broadcast in HD. What's the deal?

I completely forgot Michigan-Ohio State was on this morning at 9am, and was pleasantly surprised to find it on ABC when I switched on the TV. Of course it was in ABC's HD. The 9am ESPN game (Illinois-Northwestern) was in HD. Now Washington-Cal is on ABC, and it's SD upconverted to HD. Meanwhile Penn State-Michigan State, on ESPN, is in ABC's HD.

It can't be a bandwidth restriction, because regardless of original source video, my cable box is getting a 720p signal. That, and both CBS and NBC are showing football games in HD as well.

My guess is that ABC has some kind of technical restriction, either in the number of HD cameras (and related equipment) they can distribute each weekend, or that their equipment they use to receive feeds from their games can only handle so much input.

Regardless of the reason, ABC has ESPN for their sports department, and they should understand the value of broadcasting every game possible in HD. The viewing experience is simply better in HD.

Hopefully this won't be an issue in the coming years.