We have ordered SD PPVs occasionally, but if the HD PPV selection is as good as the SD's, we would have ordered the HD versions for $1 extra easily.
BTW if you ask about the SD PPV survey, the breakdown may be similar, yet you don't see them taking off some from the large number of the SD PPV channels. In fact if you survey how many ordered PPV porns, I bet even a smaller percentage had done so but still it is a big renevue source. Like the math a previous post did, $3.8 million additional income is not bad for 5 HD PPV channels. If they remove most of them and put three new HD channels on instead, I bet the additional revenue would not justify it because they can not charge extra for adding that three, and depending on who you talk to I doubt three more HD's will suddenly get a lot of people to move to E* from D* either.