I think I may be able to speak on this somewhat. I work in post production in Nashville and we do a ton of country music videos that air on CMT, which is operated under the MTV Networks. Even though we do alot of HD work, I am still amazed at how few videos are still only done in SD. Now I know the budgets for country videos are less than Rock/R&B, so that might explain it some, but that is probably why there isn't alot of true HD videos on MTVHD because they aren't being supplied. just a guess.